diff --git a/src/component/Modals/ConcurrentOption.js b/src/component/Modals/ConcurrentOption.js
new file mode 100644
index 0000000..a3bf0cd
--- /dev/null
+++ b/src/component/Modals/ConcurrentOption.js
@@ -0,0 +1,62 @@
+import React, { useState } from "react";
+import { Input, InputLabel, makeStyles } from "@material-ui/core";
+import {
+    Button,
+    Dialog,
+    DialogActions,
+    DialogContent,
+    DialogTitle,
+} from "@material-ui/core";
+import FormControl from "@material-ui/core/FormControl";
+import Auth from "../../middleware/Auth";
+const useStyles = makeStyles((theme) => ({}));
+
+export default function ConcurrentOptionDialog({ open, onClose, onSave }) {
+    const [count, setCount] = useState(
+        Auth.GetPreferenceWithDefault("concurrent_limit", "5")
+    );
+    const classes = useStyles();
+
+    return (
+        <Dialog
+            fullWidth
+            maxWidth={"xs"}
+            open={open}
+            onClose={onClose}
+            aria-labelledby="form-dialog-title"
+        >
+            <DialogTitle id="form-dialog-title">任务并行数量</DialogTitle>
+
+            <DialogContent>
+                <FormControl fullWidth>
+                    <InputLabel htmlFor="component-helper">
+                        同时上传的任务数量
+                    </InputLabel>
+                    <Input
+                        type={"number"}
+                        inputProps={{
+                            min: 1,
+                            step: 1,
+                            max: 20,
+                        }}
+                        value={count}
+                        onChange={(e) => setCount(e.target.value)}
+                    />
+                </FormControl>
+            </DialogContent>
+
+            <DialogActions>
+                <Button onClick={onClose}>取消</Button>
+                <div className={classes.wrapper}>
+                    <Button
+                        color="primary"
+                        disabled={count === ""}
+                        onClick={() => onSave(count)}
+                    >
+                        确定
+                    </Button>
+                </div>
+            </DialogActions>
+        </Dialog>
+    );
+}
diff --git a/src/component/Uploader/Popup/MoreActions.js b/src/component/Uploader/Popup/MoreActions.js
index d9edce4..caf9292 100644
--- a/src/component/Uploader/Popup/MoreActions.js
+++ b/src/component/Uploader/Popup/MoreActions.js
@@ -6,7 +6,7 @@ import {
     MenuItem,
     Tooltip,
 } from "@material-ui/core";
-import React, { useCallback, useMemo } from "react";
+import React, { useCallback, useMemo, useState } from "react";
 import { useDispatch } from "react-redux";
 import API from "../../../middleware/Api";
 import { TaskType } from "../core/types";
@@ -15,6 +15,9 @@ import Divider from "@material-ui/core/Divider";
 import CheckIcon from "@material-ui/icons/Check";
 import { DeleteEmpty } from "mdi-material-ui";
 import DeleteIcon from "@material-ui/icons/Delete";
+import ConcurrentOptionDialog from "../../Modals/ConcurrentOption";
+import Auth from "../../../middleware/Auth";
+import { ClearAll } from "@material-ui/icons";
 
 const useStyles = makeStyles((theme) => ({
     icon: {
@@ -37,6 +40,7 @@ export default function MoreActions({
 }) {
     const classes = useStyles();
     const dispatch = useDispatch();
+    const [concurrentDialog, setConcurrentDialog] = useState(false);
     const ToggleSnackbar = useCallback(
         (vertical, horizontal, msg, color) =>
             dispatch(toggleSnackbar(vertical, horizontal, msg, color)),
@@ -126,6 +130,13 @@ export default function MoreActions({
                 onClick: () => cleanFinished(),
                 icon: <DeleteIcon />,
                 text: "清除已完成任务",
+                divider: true,
+            },
+            {
+                tooltip: "清除列表中已完成、失败、被取消的任务",
+                onClick: () => setConcurrentDialog(true),
+                icon: <ClearAll />,
+                text: "设置并行数量",
                 divider: false,
             },
         ],
@@ -140,25 +151,44 @@ export default function MoreActions({
         ]
     );
 
+    const onConcurrentLimitSave = (val) => {
+        val = parseInt(val);
+        if (val > 0) {
+            Auth.SetPreference("concurrent_limit", val);
+            uploadManager.changeConcurrentLimit(parseInt(val));
+        }
+        setConcurrentDialog(false);
+    };
+
     return (
-        <Menu id={id} open={open} anchorEl={anchorEl} onClose={onClose}>
-            {listItems.map((item) => (
-                <>
-                    <Tooltip
-                        enterNextDelay={500}
-                        key={item.text}
-                        title={item.tooltip}
-                    >
-                        <MenuItem dense onClick={actionClicked(item.onClick)}>
-                            <ListItemIcon className={classes.icon}>
-                                {item.icon}
-                            </ListItemIcon>
-                            {item.text}
-                        </MenuItem>
-                    </Tooltip>
-                    {item.divider && <Divider />}
-                </>
-            ))}
-        </Menu>
+        <>
+            <Menu id={id} open={open} anchorEl={anchorEl} onClose={onClose}>
+                {listItems.map((item) => (
+                    <>
+                        <Tooltip
+                            enterNextDelay={500}
+                            key={item.text}
+                            title={item.tooltip}
+                        >
+                            <MenuItem
+                                dense
+                                onClick={actionClicked(item.onClick)}
+                            >
+                                <ListItemIcon className={classes.icon}>
+                                    {item.icon}
+                                </ListItemIcon>
+                                {item.text}
+                            </MenuItem>
+                        </Tooltip>
+                        {item.divider && <Divider />}
+                    </>
+                ))}
+            </Menu>
+            <ConcurrentOptionDialog
+                open={concurrentDialog}
+                onClose={() => setConcurrentDialog(false)}
+                onSave={onConcurrentLimitSave}
+            />
+        </>
     );
 }
diff --git a/src/component/Uploader/Popup/TaskList.js b/src/component/Uploader/Popup/TaskList.js
index 87ebb05..2c63b64 100644
--- a/src/component/Uploader/Popup/TaskList.js
+++ b/src/component/Uploader/Popup/TaskList.js
@@ -109,9 +109,6 @@ const filters = {
     ongoing: (u) => u.status < Status.finished,
 };
 
-const getTaskListPreference = (key, defaultVal) =>
-    Auth.GetPreference(key) ? Auth.GetPreference(key) : defaultVal;
-
 export default function TaskList({
     open,
     onClose,
diff --git a/src/component/Uploader/Uploader.js b/src/component/Uploader/Uploader.js
index 0df3100..d8e4163 100644
--- a/src/component/Uploader/Uploader.js
+++ b/src/component/Uploader/Uploader.js
@@ -13,6 +13,7 @@ import {
     refreshStorage,
     toggleSnackbar,
 } from "../../redux/explorer";
+import Auth from "../../middleware/Auth";
 
 let totalProgressCollector = null;
 let lastProgressStart = -1;
@@ -82,7 +83,9 @@ export default function Uploader() {
     const uploadManager = useMemo(() => {
         return new UploadManager({
             logLevel: "INFO",
-            concurrentLimit: 5,
+            concurrentLimit: parseInt(
+                Auth.GetPreferenceWithDefault("concurrent_limit", "5")
+            ),
             dropZone: document.querySelector("body"),
             onToast: (type, msg) => {
                 ToggleSnackbar("top", "right", msg, type);
diff --git a/src/component/Uploader/core/index.ts b/src/component/Uploader/core/index.ts
index 64eba59..11ef391 100644
--- a/src/component/Uploader/core/index.ts
+++ b/src/component/Uploader/core/index.ts
@@ -79,6 +79,10 @@ export default class UploadManager {
         }
     }
 
+    changeConcurrentLimit = (newLimit: number) => {
+        this.pool.limit = newLimit;
+    };
+
     dispatchUploader(task: Task): Base {
         if (task.type == TaskType.resumeHint) {
             return new ResumeHint(task, this);
diff --git a/src/component/Uploader/core/utils/pool.ts b/src/component/Uploader/core/utils/pool.ts
index 143828d..e7dd020 100644
--- a/src/component/Uploader/core/utils/pool.ts
+++ b/src/component/Uploader/core/utils/pool.ts
@@ -11,7 +11,7 @@ export class Pool {
     queue: Array<QueueContent> = [];
     processing: Array<QueueContent> = [];
 
-    constructor(private limit: number) {}
+    constructor(public limit: number) {}
 
     enqueue(uploader: Base) {
         return new Promise<void>((resolve, reject) => {