diff --git a/hgdriver/hgdev/hg_scanner_239.cpp b/hgdriver/hgdev/hg_scanner_239.cpp
index dad08fe..b9a0635 100644
--- a/hgdriver/hgdev/hg_scanner_239.cpp
+++ b/hgdriver/hgdev/hg_scanner_239.cpp
@@ -1538,6 +1538,11 @@ void hg_scanner_239::thread_get_dves_image(void)
 			// error handling ...
 			VLOG_MINI_4(LOG_LEVEL_DEBUG_INFO, "Read HGEIntInfo: From = %d, Code = %d, Img_Index = %d, status = %s\n", info->From, info->Code, info->Img_Index, hg_scanner_err_description(status_));
 		}
+
+		if (SCANNER_ERR_DEVICE_NOT_FOUND == ret)
+		{
+			break;
+		}
 	}
 	this_thread::sleep_for(chrono::milliseconds(10));
 	// stop 通过int端点返回 如果不反回则是固件问题，软件不做处理
diff --git a/hgdriver/hgdev/hg_scanner_300.cpp b/hgdriver/hgdev/hg_scanner_300.cpp
index b9620c1..41d660a 100644
--- a/hgdriver/hgdev/hg_scanner_300.cpp
+++ b/hgdriver/hgdev/hg_scanner_300.cpp
@@ -305,6 +305,11 @@ void hg_scanner_300::thread_handle_usb_read(void)
 			}
 		}	
 		this_thread::sleep_for(chrono::milliseconds(10));
+
+		if (SCANNER_ERR_DEVICE_NOT_FOUND == ret)
+		{
+			break;
+		}
 	}
 	VLOG_MINI_2(LOG_LEVEL_DEBUG_INFO, "USB thread exit with code: %s, status = %s\n", hg_scanner_err_name(ret), hg_scanner_err_description(status_));
 }
diff --git a/hgdriver/hgdev/hg_scanner_306.cpp b/hgdriver/hgdev/hg_scanner_306.cpp
index 64645a6..0b00047 100644
--- a/hgdriver/hgdev/hg_scanner_306.cpp
+++ b/hgdriver/hgdev/hg_scanner_306.cpp
@@ -256,6 +256,11 @@ void hg_scanner_306::thread_handle_usb_read(void)
 			}
 		}	
 		this_thread::sleep_for(chrono::milliseconds(10));
+
+		if (SCANNER_ERR_DEVICE_NOT_FOUND == ret)
+		{
+			break;
+		}
 	}
 	VLOG_MINI_2(LOG_LEVEL_DEBUG_INFO, "USB thread exit with code: %s, status = %s\n", hg_scanner_err_name(ret), hg_scanner_err_description(status_));
 }