diff --git a/src/common/queue-task.ts b/src/common/queue-task.ts
new file mode 100644
index 0000000..f96ac9c
--- /dev/null
+++ b/src/common/queue-task.ts
@@ -0,0 +1,77 @@
+export class QueueTask {
+    maxRetry: number = 0
+    queueInterval: number = 0
+    maxPending: number = 0
+    retryInterval: number = 0
+
+    lastTaskScheduled: number = 0
+    pending: number = 0
+
+    checkPointWait!: Promise<void>
+    checkPointResolve: any
+
+    constructor({
+        maxRetry = 10,
+        queueInterval = 0,
+        maxPending = 0,
+        retryInterval = 0,
+    }) {
+        this.maxRetry = maxRetry
+        this.queueInterval = queueInterval
+        this.maxPending = maxPending
+        this.retryInterval = retryInterval
+        this.refreshCheckPoint()
+    }
+
+    async refreshCheckPoint() {
+        this.checkPointWait = new Promise((resolve) => {
+            this.checkPointResolve = resolve
+        })
+    }
+
+    async tickThread() {
+        return new Promise(async (resolve) => {
+            let now = Date.now().valueOf()
+            if (this.maxPending > 0) {
+                while (this.pending >= this.maxPending) {
+                    await this.checkPointWait
+                    this.checkPointWait = new Promise((resolve) => {
+                        this.checkPointResolve = resolve
+                    })
+                }
+            }
+            if (now - this.lastTaskScheduled < this.queueInterval) {
+                let delta = this.queueInterval - (now - this.lastTaskScheduled)
+                setTimeout(() => {
+                    resolve(true)
+                }, delta)
+                this.lastTaskScheduled = delta
+                return
+            } else {
+                this.lastTaskScheduled = now
+                resolve(true)
+                return
+            }
+        })
+    }
+
+    async run(func: Function, retry: number = this.maxRetry): Promise<any> {
+        let lastError
+        for (let i = 0; i < retry; i++) {
+            await this.tickThread()
+            this.pending++
+            try {
+                let res = await func()
+                this.pending--
+                this.checkPointResolve(true)
+                return res
+            } catch (err: any) {
+                lastError = err
+                this.pending--
+                this.checkPointResolve(true)
+                new Promise((r) => setTimeout(r, this.retryInterval))
+            }
+        }
+        if (lastError) throw lastError
+    }
+}
diff --git a/src/storage/SLIStorage.ts b/src/storage/SLIStorage.ts
index a2ee0e9..a09fd6d 100644
--- a/src/storage/SLIStorage.ts
+++ b/src/storage/SLIStorage.ts
@@ -4,6 +4,7 @@ import { ethers } from "ethers"
 import ipfsConf from "../config/ipfs.js"
 import axios from "axios"
 import { Git3Protocol } from "../common/git3-protocol.js"
+import { QueueTask } from "../common/queue-task.js"
 
 export class SLIStorage implements Storage {
     repoName: string
@@ -16,8 +17,11 @@ export class SLIStorage implements Storage {
     maxBatchSize = 20
     commitTimer: any
 
-    storageIntervalLimit = 500
-    storageCallLastTime = 0
+    taskRunning = 0
+    waitTasks: Promise<void>
+    uploadDone: any
+
+    storageTask: QueueTask
 
     constructor(protocol: Git3Protocol) {
         this.repoName = protocol.repoName
@@ -28,6 +32,17 @@ export class SLIStorage implements Storage {
             "Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJkaWQ6ZXRocjoweGFEQTdCOWFlQTdGNTc2ZDI5NzM0ZWUxY0Q2ODVFMzc2OWNCM2QwRDEiLCJpc3MiOiJuZnQtc3RvcmFnZSIsImlhdCI6MTY3NTQ5NDYwMDkzMiwibmFtZSI6ImZ2bS1oYWNrc29uIn0.YBqfsj_LTZSJPKc0OH586avnQNqove_Htzl5rrToXTk"
 
         this.txManager = new TxManager(this.contract, protocol.chainId, protocol.netConfig.txConst)
+
+        this.waitTasks = new Promise((resolve, reject) => {
+            this.uploadDone = resolve
+        })
+
+        this.storageTask = new QueueTask({
+            maxRetry: 10,
+            queueInterval: 400,
+            maxPending: 20,
+            retryInterval: 500,
+        })
     }
 
     async repoRoles(): Promise<string[]> {
@@ -75,10 +90,10 @@ export class SLIStorage implements Storage {
             if (this.commitTimer) clearTimeout(this.commitTimer)
 
             if (this.batchQueue.length >= this.maxBatchSize) {
-                await this.commitQueue("full")
+                this.commitQueue("full")
             } else {
-                this.commitTimer = setTimeout(async () => {
-                    await this.commitQueue("timeout")
+                this.commitTimer = setTimeout(() => {
+                    this.commitQueue("timeout")
                 }, 3000)
             }
 
@@ -98,6 +113,7 @@ export class SLIStorage implements Storage {
     }
 
     async uploadCommit(): Promise<Status> {
+        await this.waitTasks
         return Status.SUCCEED
         // try {
         //     await this.commitQueue("uploadCommit")
@@ -110,16 +126,32 @@ export class SLIStorage implements Storage {
     }
 
     async commitQueue(reason: string) {
+        this.taskRunning += 1
+
         let queue = this.batchQueue
         this.batchQueue = []
 
         console.error(`[${reason}] commit queue length ${queue.length}`)
         if (queue.length === 0) return
-        await this.txManager.SendCall("batchUpload", [
-            Buffer.from(this.repoName),
-            queue.map((i) => Buffer.from(i.path)),
-            queue.map((i) => Buffer.from(i.cid)),
-        ])
+
+        let err
+        try {
+            await this.txManager.SendCall("batchUpload", [
+                Buffer.from(this.repoName),
+                queue.map((i) => Buffer.from(i.path)),
+                queue.map((i) => Buffer.from(i.cid)),
+            ])
+            err = null
+        } catch (error: any) {
+            this.txManager.CancelAll()
+            console.error(`upload failed: ${error}`)
+            err = error
+        }
+        this.taskRunning -= 1
+        if (this.taskRunning === 0) {
+            if (err) this.uploadDone(Status.FAILED)
+            else this.uploadDone(Status.SUCCEED)
+        }
     }
 
     remove(path: string): Promise<Status> {
@@ -159,26 +191,10 @@ export class SLIStorage implements Storage {
     }
 
     async storeIPFS(data: Buffer): Promise<string> {
-        const RETRY_TIMES = 10
         const TIMEOUT = 30
-        let response
-        let lastError
-
-        // while (this.storageAPICallCount >= this.storageAPILimit) {
-        //     await new Promise((r) => setTimeout(r, 1000))
-        // }
-
-        for (let i = 0; i < RETRY_TIMES; i++) {
-            try {
-                while (
-                    Date.now().valueOf() - this.storageCallLastTime <
-                    this.storageIntervalLimit
-                ) {
-                    await new Promise((r) => setTimeout(r, this.storageIntervalLimit / 2))
-                }
-                this.storageCallLastTime = Date.now().valueOf()
-
-                response = await axios.post("https://api.nft.storage/upload", data, {
+        try {
+            let cid = this.storageTask.run(async () => {
+                let response = await axios.post("https://api.nft.storage/upload", data, {
                     headers: {
                         "Content-Type": "application/octet-stream",
                         Authorization: this.auth,
@@ -188,14 +204,29 @@ export class SLIStorage implements Storage {
                 if (response.status == 200) {
                     return response.data.value.cid
                 } else {
-                    lastError = response.status
+                    throw new Error(`response code: ${response.status}`)
                 }
-            } catch (e) {
-                //pass
-                lastError = e
-                new Promise((r) => setTimeout(r, 1000))
-            }
+            })
+            return cid
+        } catch (e) {
+            throw new Error(`store ipfs failed: ${e}`)
         }
-        throw new Error(`store ipfs failed: ${response?.status} ${lastError}`)
+
+        // for (let i = 0; i < RETRY_TIMES; i++) {
+        //     try {
+        //         while (
+        //             Date.now().valueOf() - this.storageCallLastTime <
+        //             this.storageIntervalLimit
+        //         ) {
+        //             await new Promise((r) => setTimeout(r, this.storageIntervalLimit / 2))
+        //         }
+        //         this.storageCallLastTime = Date.now().valueOf()
+
+        //     } catch (e) {
+        //         //pass
+        //         lastError = e
+        //         new Promise((r) => setTimeout(r, 1000))
+        //     }
+        // }
     }
 }