diff --git a/func/Module_resp_quality_label.py b/func/Module_resp_quality_label.py
index fa4c035..5afbfd2 100644
--- a/func/Module_resp_quality_label.py
+++ b/func/Module_resp_quality_label.py
@@ -907,7 +907,7 @@ class MainWindow_resp_quality_label(QMainWindow):
                 PublicFunc.text_output(self.ui, Constants.RESP_QUALITY_LABEL_VIEWING_THE_FIRST_PART, Constants.MSGBOX_TYPE_INFO)
                 PublicFunc.msgbox_output(self, Constants.RESP_QUALITY_LABEL_VIEWING_THE_FIRST_PART, Constants.MSGBOX_TYPE_INFO)
                 return
-            Config["CurrentPartNum"] = max(Config["CurrentPartNum"] - 1, 0)
+            Config["CurrentPartNum"] = Config["CurrentPartNum"] - 1
             Config["CurrentOrgBCGIndex"] = ((Config["CurrentPartNum"] - 1) * Params.RESP_QUALITY_LABEL_PARTS_TIME_SEC *
                                             int(Config["InputConfig"]["OrgBCGUseFreq"]))
             Config["CurrentThoIndex"] = ((Config["CurrentPartNum"] - 1) * Params.RESP_QUALITY_LABEL_PARTS_TIME_SEC *
@@ -938,7 +938,7 @@ class MainWindow_resp_quality_label(QMainWindow):
                 PublicFunc.text_output(self.ui, Constants.RESP_QUALITY_LABEL_VIEWING_THE_LAST_PART, Constants.MSGBOX_TYPE_INFO)
                 PublicFunc.msgbox_output(self, Constants.RESP_QUALITY_LABEL_VIEWING_THE_LAST_PART, Constants.MSGBOX_TYPE_INFO)
                 return
-            Config["CurrentPartNum"] = min(Config["CurrentPartNum"] + 1, Config["DataPartNum"])
+            Config["CurrentPartNum"] = Config["CurrentPartNum"] + 1
             Config["CurrentOrgBCGIndex"] = ((Config["CurrentPartNum"] - 1) * Params.RESP_QUALITY_LABEL_PARTS_TIME_SEC *
                                             int(Config["InputConfig"]["OrgBCGUseFreq"]))
             Config["CurrentThoIndex"] = ((Config["CurrentPartNum"] - 1) * Params.RESP_QUALITY_LABEL_PARTS_TIME_SEC *