diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5f17062..843383b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 3.0.0-rc.8
+- svg解码单位改为px
+- 修复预加载接口preLoadCache传ImageKnifeOption失效
+- 文件缓存初始化接口新增目录参数
+
 ## 3.0.0-rc.7
 - 修复成功回调获取不到宽高
 - 新增svg图片解码
diff --git a/entry/src/main/ets/pages/TestPrefetchToFileCache.ets b/entry/src/main/ets/pages/TestPrefetchToFileCache.ets
index d6b9e23..eb735a7 100644
--- a/entry/src/main/ets/pages/TestPrefetchToFileCache.ets
+++ b/entry/src/main/ets/pages/TestPrefetchToFileCache.ets
@@ -26,11 +26,18 @@ struct TestPrefetchToFileCachePage {
     let fileCachePath = await ImageKnife.getInstance().preLoadCache(url)
     console.log("preload-fileCachePath=="+ fileCachePath)
   }
+  async preload1(url:string) {
+    let fileCachePath = await ImageKnife.getInstance().preLoadCache({ loadSrc: url })
+    console.log("preload-fileCachePath1=="+ fileCachePath)
+  }
   build() {
     Column() {
-      Button("预加载图片到文件缓存").margin({top:10}).onClick(async ()=>{
+      Button("url预加载图片到文件缓存").margin({top:10}).onClick(async ()=>{
         await this.preload("https://gd-hbimg.huaban.com/e0a25a7cab0d7c2431978726971d61720732728a315ae-57EskW_fw658")
       })
+      Button("option预加载图片到文件缓存").margin({top:10}).onClick(async ()=>{
+        await this.preload1("https://gd-hbimg.huaban.com/e0a25a7cab0d7c2431978726971d61720732728a315ae-57EskW_fw658")
+      })
       Button("加载图片(预加载后可断网加载)").margin({top:10}).onClick(()=>{
         this.imageKnifeOption.loadSrc = "https://gd-hbimg.huaban.com/e0a25a7cab0d7c2431978726971d61720732728a315ae-57EskW_fw658"
       })
diff --git a/library/oh-package.json5 b/library/oh-package.json5
index a584ba0..c206a0f 100644
--- a/library/oh-package.json5
+++ b/library/oh-package.json5
@@ -14,7 +14,7 @@
   "main": "index.ets",
   "repository": "https://gitee.com/openharmony-tpc/ImageKnife",
   "type": "module",
-  "version": "3.0.0-rc.7",
+  "version": "3.0.0-rc.8",
   "dependencies": {
     "@ohos/gpu_transform": "^1.0.2"
   },
diff --git a/library/src/main/ets/ImageKnife.ets b/library/src/main/ets/ImageKnife.ets
index 19b4d08..e58fadd 100644
--- a/library/src/main/ets/ImageKnife.ets
+++ b/library/src/main/ets/ImageKnife.ets
@@ -65,9 +65,13 @@ export class ImageKnife {
    * @param size 缓存数量
    * @param memory 内存大小
    */
-  async initFileCache(context: Context, size: number = 256, memory: number = 256 * 1024 * 1024) {
+  async initFileCache(context: Context, size: number = 256, memory: number = 256 * 1024 * 1024,path?: string) {
     this.fileCache = new FileCache(context, size, memory)
-    await this.fileCache.initFileCache()
+    if ( path != undefined ) {
+      await this.fileCache.initFileCache(path)
+    } else {
+      await this.fileCache.initFileCache()
+    }
   }
 
   /**
@@ -166,10 +170,10 @@ export class ImageKnife {
   preLoadCache(loadSrc: string | ImageKnifeOption): Promise<string> {
     return new Promise((resolve, reject) => {
       let imageKnifeOption = new ImageKnifeOption()
-      if (loadSrc instanceof ImageKnifeOption) {
-        imageKnifeOption = loadSrc
+      if (typeof loadSrc == "string") {
+        imageKnifeOption.loadSrc = loadSrc
       } else {
-        imageKnifeOption.loadSrc = loadSrc;
+        imageKnifeOption = loadSrc;
       }
       LogUtil.log("ImageKnife_DataTime_preLoadCache-imageKnifeOption:"+loadSrc)
       let fileKey = this.getEngineKeyImpl().generateFileKey(imageKnifeOption.loadSrc, imageKnifeOption.signature)
diff --git a/library/src/main/ets/ImageKnifeDispatcher.ets b/library/src/main/ets/ImageKnifeDispatcher.ets
index 56b81c3..03d7a70 100644
--- a/library/src/main/ets/ImageKnifeDispatcher.ets
+++ b/library/src/main/ets/ImageKnifeDispatcher.ets
@@ -171,7 +171,8 @@ export class ImageKnifeDispatcher {
       signature: currentRequest.imageKnifeOption.signature,
       requestSource: requestSource,
       isWatchProgress: isWatchProgress,
-      memoryKey: memoryKey
+      memoryKey: memoryKey,
+      fileCacheFolder: ImageKnife.getInstance().getFileCache().getCacheFolder()
     }
 
 
@@ -373,7 +374,7 @@ async function requestJob(request: RequestJobRequest, requestList?: List<ImageKn
   // 判断自定义下载
   if (request.customGetImage !== undefined && typeof request.src === 'string' && (request.src.indexOf("http://") == 0 || request.src.indexOf("https://") == 0)) {
     // 先从文件缓存获取
-    resBuf = FileCache.getFileCacheByFile(request.context, fileKey)
+    resBuf = FileCache.getFileCacheByFile(request.context, fileKey , request.fileCacheFolder)
     if (resBuf === undefined) {
       LogUtil.log("customGetImage customGetImage");
       resBuf = await request.customGetImage(request.context, request.src)
@@ -381,7 +382,7 @@ async function requestJob(request: RequestJobRequest, requestList?: List<ImageKn
       if (resBuf !== undefined && request.writeCacheStrategy !== CacheStrategy.Memory) {
         let copyBuf = buffer.concat([buffer.from(resBuf)]).buffer; // IDE有bug，不能直接获取resBuf.byteLength
         bufferSize = copyBuf.byteLength
-        FileCache.saveFileCacheOnlyFile(request.context, fileKey, resBuf)
+        FileCache.saveFileCacheOnlyFile(request.context, fileKey, resBuf , request.fileCacheFolder)
       }
     }
   }
@@ -389,7 +390,7 @@ async function requestJob(request: RequestJobRequest, requestList?: List<ImageKn
     if (typeof request.src === 'string') {
       if (request.src.indexOf("http://") == 0 || request.src.indexOf("https://") == 0) { //从网络下载
         // 先从文件缓存获取
-        resBuf = FileCache.getFileCacheByFile(request.context, fileKey)
+        resBuf = FileCache.getFileCacheByFile(request.context, fileKey , request.fileCacheFolder)
         if (resBuf === undefined && request.onlyRetrieveFromCache != true) {
           LogUtil.log("ImageKnife_DataTime_requestJob_httpRequest.start:"+request.src)
           let httpRequest = http.createHttp();
@@ -454,7 +455,7 @@ async function requestJob(request: RequestJobRequest, requestList?: List<ImageKn
             LogUtil.log("ImageKnife_DataTime_requestJob_saveFileCacheOnlyFile.start:"+request.src)
             let copyBuf = combineArrayBuffers(arrayBuffers); // IDE有bug，不能直接获取resBuf.byteLength
             bufferSize = copyBuf.byteLength
-            FileCache.saveFileCacheOnlyFile(request.context, fileKey, resBuf)
+            FileCache.saveFileCacheOnlyFile(request.context, fileKey, resBuf , request.fileCacheFolder)
             LogUtil.log("ImageKnife_DataTime_requestJob_saveFileCacheOnlyFile.end:"+request.src)
           }
         }
@@ -545,8 +546,8 @@ async function requestJob(request: RequestJobRequest, requestList?: List<ImageKn
     let hValue = Math.round(request.componentHeight);
     let wValue = Math.round(request.componentWidth);
     let defaultSize: image.Size = {
-      height: hValue,
-      width: wValue
+      height: vp2px(hValue),
+      width: vp2px(wValue)
     };
     let opts: image.DecodingOptions = {
       editable: true,
diff --git a/library/src/main/ets/model/ImageKnifeData.ets b/library/src/main/ets/model/ImageKnifeData.ets
index 24104f3..a37f709 100644
--- a/library/src/main/ets/model/ImageKnifeData.ets
+++ b/library/src/main/ets/model/ImageKnifeData.ets
@@ -82,5 +82,6 @@ export interface RequestJobRequest {
   engineKey: IEngineKey
   isWatchProgress: boolean
   memoryKey: string
+  fileCacheFolder: string
 }
 
diff --git a/library/src/main/ets/utils/FileCache.ets b/library/src/main/ets/utils/FileCache.ets
index 19a616c..dad888e 100644
--- a/library/src/main/ets/utils/FileCache.ets
+++ b/library/src/main/ets/utils/FileCache.ets
@@ -25,7 +25,7 @@ import { SparkMD5 } from '../3rd_party/sparkmd5/spark-md5';
  * 子线程直接读写文件
  */
 export class FileCache {
-  static readonly CACHE_FOLDER: string = "ImageKnife" // context cacheDir 的缓存文件目录
+  static CACHE_FOLDER: string = "ImageKnife" // context cacheDir 的缓存文件目录
   maxMemory: number = 0
   currentMemory: number = 0
   maxSize: number = 0
@@ -56,11 +56,11 @@ export class FileCache {
   /**
    * 遍历缓存文件目录，初始化缓存
    */
-  public async initFileCache() {
+  public async initFileCache(path: string = FileCache.CACHE_FOLDER) {
     if (this.isInited) {
       return
     }
-
+    FileCache.CACHE_FOLDER = path
     this.path = this.context?.cacheDir + FileUtils.SEPARATOR + FileCache.CACHE_FOLDER + FileUtils.SEPARATOR
     await FileUtils.getInstance().createFolder(this.path)
     // 遍历缓存目录下的文件，按照时间顺序加入缓存
@@ -107,6 +107,10 @@ export class FileCache {
     return this.isInited
   }
 
+  public getCacheFolder(): string {
+    return FileCache.CACHE_FOLDER
+  }
+
   // 添加缓存键值对,同时写文件
   put(key: string, value: ArrayBuffer): void {
     if (key == null || value == null) {
@@ -245,10 +249,10 @@ export class FileCache {
    * @param key
    * @param value
    */
-  static saveFileCacheOnlyFile(context: Context, key: string, value: ArrayBuffer): boolean {
+  static saveFileCacheOnlyFile(context: Context, key: string, value: ArrayBuffer, folder: string = FileCache.CACHE_FOLDER): boolean {
     // 写文件
     FileUtils.getInstance()
-      .writeFileSync(context.cacheDir + FileUtils.SEPARATOR + FileCache.CACHE_FOLDER + FileUtils.SEPARATOR + key, value)
+      .writeFileSync(context.cacheDir + FileUtils.SEPARATOR + folder + FileUtils.SEPARATOR + key, value)
     return true
   }
 
@@ -258,10 +262,10 @@ export class FileCache {
    * @param key
    * @returns
    */
-  static getFileCacheByFile(context: Context, key: string): ArrayBuffer | undefined {
+  static getFileCacheByFile(context: Context, key: string, folder: string = FileCache.CACHE_FOLDER): ArrayBuffer | undefined {
     // 从文件获取查看是否有缓存
     return FileUtils.getInstance()
-      .readFileSync(context.cacheDir + FileUtils.SEPARATOR + FileCache.CACHE_FOLDER + FileUtils.SEPARATOR + key)
+      .readFileSync(context.cacheDir + FileUtils.SEPARATOR + folder + FileUtils.SEPARATOR + key)
   }
 
   /**
diff --git a/sharedlibrary/src/main/ets/pages/InitImageKnife.ets b/sharedlibrary/src/main/ets/pages/InitImageKnife.ets
index 405914c..7bf492c 100644
--- a/sharedlibrary/src/main/ets/pages/InitImageKnife.ets
+++ b/sharedlibrary/src/main/ets/pages/InitImageKnife.ets
@@ -16,6 +16,6 @@ import { ImageKnife } from '@ohos/imageknife'
 import common from '@ohos.app.ability.common'
 export class InitImageKnife{
   static async init(entryContext:common.UIAbilityContext){
-    await ImageKnife.getInstance().initFileCache(entryContext, 256, 256 * 1024 * 1024)
+    await ImageKnife.getInstance().initFileCache(entryContext, 256, 256 * 1024 * 1024,"ImageKnifeCache")
   }
 }
\ No newline at end of file