diff --git a/frontend/src/main.tsx b/frontend/src/main.tsx
index 14152c0..b8118a8 100644
--- a/frontend/src/main.tsx
+++ b/frontend/src/main.tsx
@@ -619,6 +619,8 @@ function App() {
   const [busy, setBusy] = useState(false);
   const [actionError, setActionError] = useState("");
   const [uploadModalOpen, setUploadModalOpen] = useState(false);
+  const [copyModalOpen, setCopyModalOpen] = useState(false);
+  const [preprocessModalOpen, setPreprocessModalOpen] = useState(false);
   const [datasetName, setDatasetName] = useState("demo_dataset");
   const [datasetDescription, setDatasetDescription] = useState("");
   const [copyDatasetName, setCopyDatasetName] = useState("");
@@ -1004,6 +1006,22 @@ function App() {
     }
   }
 
+  function selectDataset(dataset: UploadedDataset) {
+    setSelectedDatasetName(dataset.name);
+    setDatasetName(dataset.name);
+  }
+
+  function openCopyDataset(dataset: UploadedDataset) {
+    selectDataset(dataset);
+    setCopyDatasetName(`${dataset.name}_copy`);
+    setCopyModalOpen(true);
+  }
+
+  function openPreprocessDataset(dataset: UploadedDataset) {
+    selectDataset(dataset);
+    setPreprocessModalOpen(true);
+  }
+
   async function copySelectedDataset() {
     if (!selectedDataset || !copyDatasetName.trim()) return;
     if (copyNameExists) {
@@ -1019,6 +1037,7 @@ function App() {
       });
       setSelectedDatasetName(copied.name);
       setDatasetName(copied.name);
+      setCopyModalOpen(false);
       await refresh();
     } catch (err) {
       setActionError(String(err));
@@ -1027,15 +1046,16 @@ function App() {
     }
   }
 
-  async function deleteSelectedDataset() {
-    if (!selectedDataset) return;
-    if (!window.confirm(`删除数据集 ${selectedDataset.name}？此操作会删除上传目录。`)) return;
+  async function deleteDataset(dataset: UploadedDataset) {
+    if (!window.confirm(`删除数据集 ${dataset.name}？此操作会删除上传目录。`)) return;
     setBusy(true);
     try {
       setActionError("");
-      await api(`/api/datasets/${encodeURIComponent(selectedDataset.name)}`, { method: "DELETE" });
-      setSelectedDatasetName("");
-      setDatasetName("demo_dataset");
+      await api(`/api/datasets/${encodeURIComponent(dataset.name)}`, { method: "DELETE" });
+      if (selectedDatasetName === dataset.name || datasetName === dataset.name) {
+        setSelectedDatasetName("");
+        setDatasetName("demo_dataset");
+      }
       await refresh();
     } catch (err) {
       setActionError(String(err));
@@ -1054,6 +1074,7 @@ function App() {
         body: JSON.stringify(jobPayload(next, datasetParamsForTask(next)))
       });
       await inspectJob(job);
+      setPreprocessModalOpen(false);
       navigate("training");
       await refresh();
     } catch (err) {
@@ -1430,49 +1451,26 @@ function App() {
               </label>
               <div className="datasetMiniList">
                 {datasets.map((dataset) => (
-                  <button
+                  <div
                     key={dataset.name}
-                    type="button"
-                    className={selectedDataset?.name === dataset.name ? "selected" : ""}
-                    onClick={() => {
-                      setSelectedDatasetName(dataset.name);
-                      setDatasetName(dataset.name);
-                    }}
+                    className={`datasetMiniItem ${selectedDataset?.name === dataset.name ? "selected" : ""}`}
                   >
-                    <span>{dataset.name}</span>
-                    <small>{datasetValidations[dataset.name]?.pairs.image_mask ?? 0} pair · {dataset.counts.images} images · {dataset.counts.masks} masks</small>
-                  </button>
-                ))}
-              </div>
-              <label className="field compact">
-                <span>复制为</span>
-                <input value={copyDatasetName} onChange={(event) => setCopyDatasetName(event.target.value)} />
-              </label>
-              {copyNameExists && <small className="formWarn">复制目标名称已存在。</small>}
-              <div className="buttonRow">
-                <button className="primary secondary" disabled={busy || !selectedDataset || !copyDatasetName.trim() || copyNameExists} onClick={copySelectedDataset}><Copy size={17} />复制</button>
-                <button className="primary danger" disabled={busy || !selectedDataset} onClick={deleteSelectedDataset}><Trash2 size={17} />删除</button>
-              </div>
-            </div>
-
-            <div className="preprocessBox">
-              <div className="qualityHead">
-                <strong>图片预处理</strong>
-                <span>使用手册</span>
-              </div>
-              <div className="preprocessControls">
-                <label><span>宽</span><input type="number" min={1} value={preprocessWidth} onChange={(event) => setPreprocessWidth(Number(event.target.value) || 1)} /></label>
-                <label><span>高</span><input type="number" min={1} value={preprocessHeight} onChange={(event) => setPreprocessHeight(Number(event.target.value) || 1)} /></label>
-                <label><span>前缀</span><input value={preprocessPrefix} onChange={(event) => setPreprocessPrefix(event.target.value)} /></label>
-                <label><span>后缀</span><input value={preprocessSuffix} onChange={(event) => setPreprocessSuffix(event.target.value)} /></label>
-                <label><span>透明度</span><input type="number" min={0} max={1} step={0.05} value={preprocessAlpha} onChange={(event) => setPreprocessAlpha(Number(event.target.value) || 0)} /></label>
-              </div>
-              <div className="opGrid compactOps">
-                {manualDatasetOps.map((task) => (
-                  <button key={task} type="button" disabled={busy || !selectedDataset?.absolute_layout} onClick={() => startDatasetPreprocessTask(task)}>
-                    <Wand2 size={16} />
-                    <span>{taskLabels[task]}</span>
-                  </button>
+                    <button type="button" className="datasetMiniMain" onClick={() => selectDataset(dataset)}>
+                      <span>{dataset.name}</span>
+                      <small>{datasetValidations[dataset.name]?.pairs.image_mask ?? 0} pair · {dataset.counts.images} images · {dataset.counts.masks} masks</small>
+                    </button>
+                    <div className="datasetRowActions">
+                      <button type="button" onClick={() => openPreprocessDataset(dataset)} title="图片预处理">
+                        <Wand2 size={15} />
+                      </button>
+                      <button type="button" onClick={() => openCopyDataset(dataset)} title="复制数据集">
+                        <Copy size={15} />
+                      </button>
+                      <button type="button" onClick={() => deleteDataset(dataset)} title="删除数据集">
+                        <Trash2 size={15} />
+                      </button>
+                    </div>
+                  </div>
                 ))}
               </div>
             </div>
@@ -1553,6 +1551,67 @@ function App() {
           </div>
         )}
 
+        {copyModalOpen && selectedDataset && (
+          <div className="modalOverlay" data-page-section="datasets" role="dialog" aria-modal="true" aria-label="复制数据集">
+            <div className="datasetActionModal">
+              <div className="modalHead">
+                <div>
+                  <p className="eyebrow">Copy</p>
+                  <h2>复制数据集</h2>
+                  <span className="pageHint">{selectedDataset.name}</span>
+                </div>
+                <button className="iconButton" type="button" onClick={() => setCopyModalOpen(false)} title="关闭">
+                  <X size={18} />
+                </button>
+              </div>
+              <div className="datasetForm">
+                <label className="field compact">
+                  <span>复制为</span>
+                  <input value={copyDatasetName} onChange={(event) => setCopyDatasetName(event.target.value)} />
+                </label>
+                {copyNameExists && <small className="formWarn">复制目标名称已存在。</small>}
+                <div className="modalActions">
+                  <button className="primary secondary" disabled={busy || !copyDatasetName.trim() || copyNameExists} onClick={copySelectedDataset}>
+                    <Copy size={17} />复制
+                  </button>
+                </div>
+              </div>
+            </div>
+          </div>
+        )}
+
+        {preprocessModalOpen && selectedDataset && (
+          <div className="modalOverlay" data-page-section="datasets" role="dialog" aria-modal="true" aria-label="图片预处理">
+            <div className="datasetActionModal wide">
+              <div className="modalHead">
+                <div>
+                  <p className="eyebrow">Preprocess</p>
+                  <h2>图片预处理</h2>
+                  <span className="pageHint">{selectedDataset.name}</span>
+                </div>
+                <button className="iconButton" type="button" onClick={() => setPreprocessModalOpen(false)} title="关闭">
+                  <X size={18} />
+                </button>
+              </div>
+              <div className="preprocessControls">
+                <label><span>宽</span><input type="number" min={1} value={preprocessWidth} onChange={(event) => setPreprocessWidth(Number(event.target.value) || 1)} /></label>
+                <label><span>高</span><input type="number" min={1} value={preprocessHeight} onChange={(event) => setPreprocessHeight(Number(event.target.value) || 1)} /></label>
+                <label><span>前缀</span><input value={preprocessPrefix} onChange={(event) => setPreprocessPrefix(event.target.value)} /></label>
+                <label><span>后缀</span><input value={preprocessSuffix} onChange={(event) => setPreprocessSuffix(event.target.value)} /></label>
+                <label><span>透明度</span><input type="number" min={0} max={1} step={0.05} value={preprocessAlpha} onChange={(event) => setPreprocessAlpha(Number(event.target.value) || 0)} /></label>
+              </div>
+              <div className="opGrid preprocessOps">
+                {manualDatasetOps.map((task) => (
+                  <button key={task} type="button" disabled={busy || !selectedDataset.absolute_layout} onClick={() => startDatasetPreprocessTask(task)}>
+                    <Wand2 size={16} />
+                    <span>{taskLabels[task]}</span>
+                  </button>
+                ))}
+              </div>
+            </div>
+          </div>
+        )}
+
         <section className="grid two" id="inference" data-page-section="inference">
           <div className="panel">
             <div className="panelHead">
diff --git a/frontend/src/styles.css b/frontend/src/styles.css
index 111a697..76e14ef 100644
--- a/frontend/src/styles.css
+++ b/frontend/src/styles.css
@@ -747,14 +747,12 @@ textarea {
 }
 
 .datasetManager,
-.preprocessBox,
 .datasetDetailStack {
   display: grid;
   gap: 12px;
 }
 
-.datasetManager,
-.preprocessBox {
+.datasetManager {
   padding-top: 14px;
   border-top: 1px solid var(--line);
 }
@@ -789,6 +787,21 @@ textarea {
   box-shadow: 0 28px 80px rgba(0, 0, 0, 0.55);
 }
 
+.datasetActionModal {
+  width: min(520px, 100%);
+  max-height: calc(100vh - 56px);
+  overflow: auto;
+  padding: 18px;
+  border: 1px solid rgba(157, 226, 111, 0.32);
+  border-radius: 8px;
+  background: #151815;
+  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.55);
+}
+
+.datasetActionModal.wide {
+  width: min(760px, 100%);
+}
+
 .modalHead {
   display: flex;
   align-items: center;
@@ -904,6 +917,11 @@ textarea {
   grid-template-columns: repeat(2, minmax(0, 1fr));
 }
 
+.opGrid.preprocessOps {
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+  margin-top: 12px;
+}
+
 .datasetMiniList {
   display: grid;
   gap: 7px;
@@ -911,35 +929,72 @@ textarea {
   overflow: auto;
 }
 
-.datasetMiniList button {
+.datasetMiniItem {
   min-width: 0;
   display: grid;
-  gap: 3px;
-  padding: 9px;
-  text-align: left;
+  grid-template-columns: minmax(0, 1fr) auto;
+  align-items: center;
+  gap: 8px;
+  padding: 6px;
   border: 1px solid var(--line);
   border-radius: 6px;
   background: #101310;
   color: var(--ink);
 }
 
-.datasetMiniList button.selected {
+.datasetMiniItem.selected {
   border-color: var(--green);
   background: rgba(157, 226, 111, 0.08);
 }
 
-.datasetMiniList span,
-.datasetMiniList small {
+.datasetMiniMain {
+  min-width: 0;
+  display: grid;
+  gap: 3px;
+  padding: 3px;
+  text-align: left;
+  background: transparent;
+  color: var(--ink);
+}
+
+.datasetMiniMain span,
+.datasetMiniMain small {
   min-width: 0;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 
-.datasetMiniList small {
+.datasetMiniMain small {
   color: var(--muted);
 }
 
+.datasetRowActions {
+  display: flex;
+  gap: 4px;
+}
+
+.datasetRowActions button {
+  width: 30px;
+  height: 30px;
+  display: grid;
+  place-items: center;
+  border-radius: 5px;
+  border: 1px solid var(--line);
+  background: #0b0d0b;
+  color: var(--muted);
+}
+
+.datasetRowActions button:hover {
+  color: var(--green);
+  border-color: rgba(157, 226, 111, 0.45);
+}
+
+.datasetRowActions button:last-child:hover {
+  color: var(--red);
+  border-color: rgba(240, 113, 103, 0.5);
+}
+
 .preprocessControls {
   display: grid;
   grid-template-columns: repeat(2, minmax(0, 1fr));