diff --git a/bpmm02_spread.txt b/bpmm02_spread.txt
index 38a0fac..f7973f3 100644
--- a/bpmm02_spread.txt
+++ b/bpmm02_spread.txt
@@ -47,6 +47,7 @@ main_block: BEGIN
   DECLARE v_all_signers VARCHAR(200);
   DECLARE v_done INT DEFAULT FALSE;
   DECLARE v_cnt INT;
+  DECLARE v_loop INT;
   
   SET v_crlf = CHAR(10);
   
@@ -89,8 +90,9 @@ main_block: BEGIN
   SET v_nowStep = v_nextStep;
   SET v_now_elementId = v_elementId;
   SET v_step = 1;
+  SET v_loop = 1;
   
-  WHILE v_now_elementId <> 'stopNode' DO
+  WHILE v_now_elementId <> 'stopNode' and v_loop < 100 DO
     -- 先判斷 condition true/false
     IF v_elementId = 'conditionNode' THEN
       SELECT source_table, source_pk INTO v_tablename, v_source_pk FROM bpm_list WHERE flow_id = p_uuid;  
@@ -137,6 +139,9 @@ main_block: BEGIN
       v_elementId, v_stepId, v_nextStep, v_filterSet, v_nextStep_false, v_typeName, v_roleName
     FROM bpm_setup WHERE flow_id = p_uuid AND stepId = v_nextStep;
     
+	-- 防止無窮 loop
+	SET v_loop = v_loop + 1;
+	
     SET v_step = v_step + 1;
     SET v_nowStep = v_nextStep;
     SET v_now_elementId = v_elementId;