diff --git a/java-svc/src/main/java/com/wordparse/config/WordParseConfig.java b/java-svc/src/main/java/com/wordparse/config/WordParseConfig.java
index fbc965f..8eb1998 100644
--- a/java-svc/src/main/java/com/wordparse/config/WordParseConfig.java
+++ b/java-svc/src/main/java/com/wordparse/config/WordParseConfig.java
@@ -13,12 +13,16 @@ public class WordParseConfig {
     private Map<String, String[]> cleanStyleMap = Map.of();
     private String transformScriptsPath = "/opt/transform";
     private String pythonCommand = "python3";
+    /** 私有区符号图的基址（默认我们自己的 RustFS，不依赖 jby CDN） */
+    private String symbolBaseUrl = "https://fs.code-lab.cn/temp/wordparse-symbols/";
 
     public String getTmpPath() { return tmpPath; }
     public Double getImageScalingFactor() { return imageScalingFactor; }
     public Map<String, String[]> getCleanStyleMap() { return cleanStyleMap; }
     public String getTransformScriptsPath() { return transformScriptsPath; }
     public String getPythonCommand() { return pythonCommand; }
+    public String getSymbolBaseUrl() { return symbolBaseUrl; }
+    public void setSymbolBaseUrl(String symbolBaseUrl) { this.symbolBaseUrl = symbolBaseUrl; }
 
     public void setTmpPath(String v) { this.tmpPath = v; }
     public void setImageScalingFactor(Double v) { this.imageScalingFactor = v; }
diff --git a/java-svc/src/main/java/com/wordparse/core/WordParseUtil.java b/java-svc/src/main/java/com/wordparse/core/WordParseUtil.java
index 425992b..465d0db 100644
--- a/java-svc/src/main/java/com/wordparse/core/WordParseUtil.java
+++ b/java-svc/src/main/java/com/wordparse/core/WordParseUtil.java
@@ -69,8 +69,39 @@ public class WordParseUtil {
         this.ossService = ossService;
     }
 
+    /** PUA 字符 → 4 位十六进制编号（与 static/symbols 下的文件名一致） */
+    private static String symbolCode(String sym) {
+        return String.format("%04X", (int) sym.charAt(0));
+    }
+
+    /** 记录未映射的私有区字符，便于后续扩充 PUA_TO_UNICODE */
+    private static void warnUnknownPua(String content) {
+        java.util.Set<String> unknown = new java.util.TreeSet<>();
+        for (int i = 0; i < content.length(); i++) {
+            char c = content.charAt(i);
+            if (c >= 0xE000 && c <= 0xF8FF) {
+                String s = String.valueOf(c);
+                if (!PUA_TO_UNICODE.containsKey(s) && !java.util.Arrays.asList(SYMBOL).contains(s)) {
+                    unknown.add(String.format("U+%04X", (int) c));
+                }
+            }
+        }
+        if (!unknown.isEmpty()) {
+            log.warn("存在未映射的私有区符号（建议补充 PUA_TO_UNICODE）: {}", String.join(",", unknown));
+        }
+    }
+
     private static final String MATH_PLACEHOLDER = "<w:rPr><w:rFonts w:hint=\"eastAsia\"/><w:lang w:val=\"en-US\" w:eastAsia=\"zh-CN\"/></w:rPr><w:t>%s</w:t>";
-    private static final String[] SYMBOL = {"\\ue0fc", "\\ue100", "\\ue101"};
+    private static final String[] SYMBOL = {"\ue0fc", "\ue100", "\ue101"};
+
+    /**
+     * 私有区(PUA)符号码位 → 标准 Unicode。
+     * 教辅排版软件把 ⊆ 等数学符号写成 PUA，docx4j 会原样输出，前端显示成豆腐块。
+     * 证据驱动映射：未收录的码位由 warnUnknownPua 记日志，确认含义后再补。
+     */
+    private static final Map<String, String> PUA_TO_UNICODE = Map.of(
+            "\ue089", "⊆"     // 10阶段滚动检测(一)：B?A / {2,3}?A，与同文档内真 ⊆ 用法完全一致
+    );
 
     // ---------- Class-level constants (brand-neutral replacements for jby Constants) ----------
     private static final Set<String> RETAIN_CLASS_VALUE_SET = Set.of(
@@ -158,8 +189,13 @@ public class WordParseUtil {
             content = content.replace("\u00A0", " ");
             content = content.replace("\uf028", "(");
             content = content.replace("\uf029", ")");
+            // PUA 符号 → 标准 Unicode（先于 SYMBOL 占位符，避免冲突）
+            for (Map.Entry<String, String> pua : PUA_TO_UNICODE.entrySet()) {
+                content = content.replace(pua.getKey(), pua.getValue());
+            }
+            warnUnknownPua(content);
             for (String sl : SYMBOL) {
-                content = content.replace(sl, "@@@" + sl.substring(2).toUpperCase() + "@@@");
+                content = content.replace(sl, "@@@" + symbolCode(sl) + "@@@");
             }
             content = content.replace("<w:shd w:val=\"pct15\" w:color=\"auto\" w:fill=\"FFFFFF\"/>",
                     "<w:shd w:val=\"clear\" w:color=\"FFFFFF\" w:fill=\"D9D9D9\"/>");
@@ -1200,14 +1236,13 @@ public class WordParseUtil {
                 "$1");
         for (String sym : SYMBOL) {
             Element imgElement = new Element("img");
-            imgElement.attr(HtmlAttr.SRC.getValue(),
-                    "https://resource.xinjiaoyu.com/prod/office/unicode-symbol/"
-                            + sym.substring(2).toUpperCase() + ".svg");
+            imgElement.attr(HtmlAttr.SRC.getValue(), config.getSymbolBaseUrl() + symbolCode(sym) + ".svg");
             imgElement.attr(HtmlAttr.WIDTH.getValue(), "14");
             imgElement.attr(HtmlAttr.HEIGHT.getValue(), "14");
-            result = result.replace("@@@" + sym.substring(2).toUpperCase() + "@@@", imgElement.outerHtml());
-            result = result.replace("\ue225\ue226", "\\(\\rightleftharpoons\\)");
+            result = result.replace("@@@" + symbolCode(sym) + "@@@", imgElement.outerHtml());
         }
+        // ⇌（U+E225 U+E226 成对出现）直接转 LaTeX
+        result = result.replace("\ue225\ue226", "\\(\\rightleftharpoons\\)");
         writeHtml(result);
         return result;
     }
diff --git a/java-svc/src/main/resources/application.yml.example b/java-svc/src/main/resources/application.yml.example
index e51fcdf..a1ff2f0 100644
--- a/java-svc/src/main/resources/application.yml.example
+++ b/java-svc/src/main/resources/application.yml.example
@@ -14,6 +14,7 @@ wordparse:
   image-scaling-factor: 2.0
   transform-scripts-path: /opt/transform
   python-command: python3
+  symbol-base-url: https://fs.code-lab.cn/temp/wordparse-symbols/
   oss:
     endpoint: https://fs.code-lab.cn
     access-key: ${WORDPARSE_OSS_AK:}