diff --git a/src/main/java/com/xujie/sys/modules/sampletracking/service/impl/SampleProofTrackingServiceImpl.java b/src/main/java/com/xujie/sys/modules/sampletracking/service/impl/SampleProofTrackingServiceImpl.java
index 73a85af9..5be4ba7c 100644
--- a/src/main/java/com/xujie/sys/modules/sampletracking/service/impl/SampleProofTrackingServiceImpl.java
+++ b/src/main/java/com/xujie/sys/modules/sampletracking/service/impl/SampleProofTrackingServiceImpl.java
@@ -1619,7 +1619,8 @@ public class SampleProofTrackingServiceImpl implements SampleProofTrackingServic
         }
         List<ProofTrackingProcessCategoryData> finalRows = new ArrayList<>();
         Set<String> submitCodeKeys = new LinkedHashSet<>();
-        int nextCategorySeq = resolveNextAutoProcessCategorySequence(existingRows);
+        String categoryCodePrefix = resolveProcessCategoryCodePrefixByBuNo(buNo);
+        int nextCategorySeq = resolveNextAutoProcessCategorySequence(existingRows, categoryCodePrefix);
         int sortNo = 10;
         for (ProofTrackingProcessCategoryData row : normalizedRows) {
             String rawCategoryCode = isBlank(row.getCategoryCode()) ? "" : row.getCategoryCode().trim();
@@ -1631,7 +1632,7 @@ public class SampleProofTrackingServiceImpl implements SampleProofTrackingServic
                 }
             } else {
                 while (true) {
-                    String candidateCode = buildAutoProcessCategoryCode(nextCategorySeq);
+                    String candidateCode = buildAutoProcessCategoryCode(categoryCodePrefix, nextCategorySeq);
                     nextCategorySeq += 1;
                     String candidateKey = candidateCode.toLowerCase();
                     if (reservedCodeKeys.contains(candidateKey) || submitCodeKeys.contains(candidateKey)) {
@@ -1808,7 +1809,9 @@ public class SampleProofTrackingServiceImpl implements SampleProofTrackingServic
         return rows;
     }
 
-    private int resolveNextAutoProcessCategorySequence(List<ProofTrackingProcessCategoryData> existingRows) {
+    private int resolveNextAutoProcessCategorySequence(List<ProofTrackingProcessCategoryData> existingRows,
+                                                       String categoryCodePrefix) {
+        String normalizedPrefix = isBlank(categoryCodePrefix) ? "RF" : categoryCodePrefix.trim().toUpperCase();
         int maxSequence = 0;
         if (existingRows == null || existingRows.isEmpty()) {
             return 1;
@@ -1818,24 +1821,35 @@ public class SampleProofTrackingServiceImpl implements SampleProofTrackingServic
                 continue;
             }
             String code = item.getCategoryCode().trim();
-            if (code.length() <= 3 || !code.regionMatches(true, 0, "bu-", 0, 3)) {
+            if (code.length() <= normalizedPrefix.length()
+                    || !code.regionMatches(true, 0, normalizedPrefix, 0, normalizedPrefix.length())) {
                 continue;
             }
             try {
-                int parsedSeq = Integer.parseInt(code.substring(3));
+                int parsedSeq = Integer.parseInt(code.substring(normalizedPrefix.length()));
                 if (parsedSeq > maxSequence) {
                     maxSequence = parsedSeq;
                 }
             } catch (NumberFormatException ignore) {
-                // 非 bu-数字 格式编码不参与自动序号计算。
+                // 非“前缀+数字”格式编码不参与自动序号计算。
             }
         }
         return maxSequence + 1;
     }
 
-    private String buildAutoProcessCategoryCode(int sequence) {
+    private String buildAutoProcessCategoryCode(String categoryCodePrefix, int sequence) {
+        String normalizedPrefix = isBlank(categoryCodePrefix) ? "RF" : categoryCodePrefix.trim().toUpperCase();
         int safeSequence = sequence <= 0 ? 1 : sequence;
-        return String.format("bu-%03d", safeSequence);
+        return String.format("%s%03d", normalizedPrefix, safeSequence);
+    }
+
+    private String resolveProcessCategoryCodePrefixByBuNo(String buNo) {
+        String normalizedBuNo = isBlank(buNo) ? "" : buNo.trim().toUpperCase();
+        if (normalizedBuNo.contains("RFID")) {
+            return "RFID";
+        }
+        // 软标（例如 01-Label）使用 RF 前缀；其余 BU 默认也归为 RF。
+        return "RF";
     }
 
     private String buildPlanFieldByCode(String code) {