diff --git a/src/components/dialogs/convertDialog/component.tsx b/src/components/dialogs/convertDialog/component.tsx
index d3558cc6..19112336 100644
--- a/src/components/dialogs/convertDialog/component.tsx
+++ b/src/components/dialogs/convertDialog/component.tsx
@@ -6,13 +6,13 @@ import "./convertDialog.css";
 import { ConfigService } from "../../../assets/lib/kookit-extra-browser.min";
 import BookUtil from "../../../utils/file/bookUtil";
 import {
-  getOcrPaddleLangList,
   ocrEngineList,
   ocrTesseractLangList,
   paraSpacingList,
   titleSizeList,
 } from "../../../constants/dropdownList";
 import toast from "react-hot-toast";
+import { getDefaultOcrEngine, getOcrLangList } from "../../../utils/common";
 
 class ConvertDialog extends React.Component<
   ConvertDialogProps,
@@ -27,36 +27,7 @@ class ConvertDialog extends React.Component<
       ),
     };
   }
-  getLangList = (engine: string) => {
-    let list: any[];
-    if (engine === "tesseract") {
-      list = ocrTesseractLangList;
-    } else if (engine === "official-ai-ocr") {
-      list = [
-        {
-          label: "General",
-          value: "general",
-          lang: "general",
-        },
-        {
-          label: "Accurate",
-          value: "accurate",
-          lang: "accurate",
-        },
-      ];
-    } else if (engine === "system-ocr") {
-      list = [
-        {
-          label: "Auto",
-          value: "auto",
-          lang: "auto",
-        },
-      ];
-    } else {
-      list = getOcrPaddleLangList();
-    }
-    return list;
-  };
+
   renderSwitchOption = (optionList: any[]) => {
     return optionList.map((item) => {
       return (
@@ -170,16 +141,7 @@ class ConvertDialog extends React.Component<
               <select
                 name=""
                 className="lang-setting-dropdown"
-                value={
-                  ConfigService.getReaderConfig(
-                    this.props.currentBook.description.indexOf("scanned") > -1
-                      ? "scannedOcrEngine"
-                      : "textOcrEngine"
-                  ) ||
-                  (this.props.currentBook.description.indexOf("scanned") > -1
-                    ? "paddle"
-                    : "system-ocr")
-                }
+                value={getDefaultOcrEngine(this.props.currentBook)}
                 onChange={(event) => {
                   if (
                     event.target.value === "official-ai-ocr" &&
@@ -228,23 +190,15 @@ class ConvertDialog extends React.Component<
                   this.forceUpdate();
                 }}
               >
-                {ocrEngineList
-                  .filter((item) => {
-                    if (!isElectron && item.value === "system-ocr") {
-                      return false;
-                    }
-                    return true;
-                  })
-                  .map((item) => (
-                    <option
-                      value={item.value}
-                      key={item.value}
-                      className="lang-setting-option"
-                    >
-                      {this.props.t(item.label) +
-                        (item.isPro ? " (Pro)" : "")}
-                    </option>
-                  ))}
+                {ocrEngineList.map((item) => (
+                  <option
+                    value={item.value}
+                    key={item.value}
+                    className="lang-setting-option"
+                  >
+                    {this.props.t(item.label) + (item.isPro ? " (Pro)" : "")}
+                  </option>
+                ))}
               </select>
             </div>
             {this.props.currentBook.description.indexOf("scanned") === -1 &&
@@ -407,7 +361,7 @@ class ConvertDialog extends React.Component<
                     );
                     const currentLang = ConfigService.getReaderConfig("lang");
 
-                    const match = this.getLangList(engine).find(
+                    const match = getOcrLangList(engine).find(
                       (o: any) => o.lang === currentLang
                     );
                     return match ? match.value : "";
@@ -431,13 +385,8 @@ class ConvertDialog extends React.Component<
                 >
                   {[
                     { label: "Please select", value: "", lang: "" },
-                    ...(this.getLangList(
-                      ConfigService.getReaderConfig(
-                        this.props.currentBook.description.indexOf("scanned") >
-                          -1
-                          ? "scannedOcrEngine"
-                          : "textOcrEngine"
-                      )
+                    ...(getOcrLangList(
+                      getDefaultOcrEngine(this.props.currentBook)
                     ) || []),
                   ].map((item) => (
                     <option
diff --git a/src/containers/viewer/component.tsx b/src/containers/viewer/component.tsx
index 0d7ed98f..b8d4ef5d 100644
--- a/src/containers/viewer/component.tsx
+++ b/src/containers/viewer/component.tsx
@@ -14,6 +14,8 @@ import Note from "../../models/Note";
 import PageWidget from "../pageWidget";
 import {
   BRUSH_WIDTHS,
+  getDefaultOcrEngine,
+  getDefaultOcrLang,
   getPageWidth,
   getParserRegex,
   getPdfPassword,
@@ -25,16 +27,10 @@ import _ from "underscore";
 import { ConfigService } from "../../assets/lib/kookit-extra-browser.min";
 import * as Kookit from "../../assets/lib/kookit.min";
 import PopupRefer from "../../components/popups/popupRefer";
-import {
-  ocrEngineList,
-  ocrTesseractLangList,
-} from "../../constants/dropdownList";
 import DatabaseService from "../../utils/storage/databaseService";
 import { getOcrResult, getOcrResultV2 } from "../../utils/request/reader";
 import { BookHelper } from "../../assets/lib/kookit.min";
-import {
-  parseWithSystemOCR,
-} from "../../utils/request/common";
+import { parseWithSystemOCR } from "../../utils/request/common";
 declare var window: any;
 let lock = false; //prevent from clicking too fasts
 
@@ -293,27 +289,19 @@ class Viewer extends React.Component<ViewerProps, ViewerState> {
           ).includes(this.props.currentBook.key)
             ? "yes"
             : "no",
-          ocrLang: ConfigService.getReaderConfig(ocrLangKey)
-            ? ConfigService.getReaderConfig(ocrLangKey)
-            : ConfigService.getReaderConfig(ocrEngineKey) === "tesseract"
-              ? ocrTesseractLangList.find(
-                  (item) => item.lang === ConfigService.getReaderConfig("lang")
-                )?.value || "chi_sim"
-              : ConfigService.getReaderConfig(ocrEngineKey)
-                ? ocrEngineList.find(
-                    (item) =>
-                      item.value === ConfigService.getReaderConfig(ocrEngineKey)
-                  )?.lang || "general"
-                : "standard_v5_mobile",
+          ocrLang: getDefaultOcrLang(
+            getDefaultOcrEngine(this.props.currentBook),
+            this.props.currentBook
+          ),
           externalWorker: {
             recognize:
-              ConfigService.getReaderConfig(ocrEngineKey) === "system-ocr"
+              getDefaultOcrEngine(this.props.currentBook) === "system-ocr"
                 ? parseWithSystemOCR
                 : ConfigService.getReaderConfig(ocrLangKey) === "accurate"
-                    ? getOcrResultV2
-                    : getOcrResult,
+                  ? getOcrResultV2
+                  : getOcrResult,
           },
-          ocrEngine: ConfigService.getReaderConfig(ocrEngineKey) || "paddle",
+          ocrEngine: getDefaultOcrEngine(this.props.currentBook),
           serverRegion:
             getServerRegion() === "china" && this.props.isAuthed
               ? "china"
diff --git a/src/utils/common.ts b/src/utils/common.ts
index 9054cfce..b0aeace5 100644
--- a/src/utils/common.ts
+++ b/src/utils/common.ts
@@ -31,6 +31,10 @@ import { driveList } from "../constants/driveList";
 import { updateUserConfig } from "./request/user";
 import { languageCNMap, languageENMap } from "../constants/ttsList";
 import { BookHelper } from "../assets/lib/kookit.min";
+import {
+  getOcrPaddleLangList,
+  ocrTesseractLangList,
+} from "../constants/dropdownList";
 declare var window: any;
 export const supportedFormats = [
   ".epub",
@@ -1917,3 +1921,67 @@ export const BRUSH_COLORS = [
 ];
 
 export const BRUSH_WIDTHS = [2, 4, 8, 14];
+export const getDefaultOcrEngine = (currentBook: any) => {
+  const engine = ConfigService.getReaderConfig(
+    currentBook.description.indexOf("scanned") > -1
+      ? "scannedOcrEngine"
+      : "textOcrEngine"
+  );
+  if (engine) return engine;
+  if (currentBook.description.indexOf("scanned") > -1) {
+    return "paddle";
+  } else {
+    return "system-ocr";
+  }
+};
+export const getOcrLangList = (engine: string) => {
+  let list: any[];
+  if (engine === "tesseract") {
+    list = ocrTesseractLangList;
+  } else if (engine === "official-ai-ocr") {
+    list = [
+      {
+        label: "General",
+        value: "general",
+        lang: "general",
+      },
+      {
+        label: "Accurate",
+        value: "accurate",
+        lang: "accurate",
+      },
+    ];
+  } else if (engine === "system-ocr") {
+    list = [
+      {
+        label: "Auto",
+        value: "auto",
+        lang: "auto",
+      },
+    ];
+  } else {
+    list = getOcrPaddleLangList();
+  }
+  return list;
+};
+export const getDefaultOcrLang = (engine: string, currentBook: any) => {
+  const lang = ConfigService.getReaderConfig(
+    currentBook.description.indexOf("scanned") > -1
+      ? "scannedOcrLang"
+      : "textOcrLang"
+  );
+  if (lang) return lang;
+  if (engine === "tesseract") {
+    return (
+      ocrTesseractLangList.find(
+        (item) => item.lang === ConfigService.getReaderConfig("lang")
+      )?.value || "chi_sim"
+    );
+  } else if (engine === "official-ai-ocr") {
+    return "general";
+  } else if (engine === "system-ocr") {
+    return "auto";
+  } else if (engine === "paddle") {
+    return "standard_v5_mobile";
+  }
+};