diff --git a/src/paras.h b/src/paras.h
index e7919c7..26cccbb 100644
--- a/src/paras.h
+++ b/src/paras.h
@@ -12,7 +12,7 @@
     PARA( sp           , double , '\0'  ,  false   , 0.01  , 0  , 1         , "max input numbers of LUT") \
     PARA( brk_sp       , double , '\0'  ,  false   , 0.05  , 0  , 1         , "max input numbers of LUT") \
     PARA( t            , int    , '\0'  ,  false   , 30    , 0  , 1000      , "max input numbers of LUT") \
-    PARA( vsat_inc     , int    , '\0'  ,  false   , 10    , 0  , 100000    , "max input numbers of LUT") \
+    PARA( vsat_inc     , int    , '\0'  ,  false   , 1     , 0  , 100000    , "max input numbers of LUT") \
     PARA( vsat_max     , int    , '\0'  ,  false   , 10000 , 0  , 100000    , "max input numbers of LUT") \
     PARA( fw_inc       , int    , '\0'  ,  false   , 1     , 0  , 1000      , "max input numbers of LUT") \
     PARA( fw_max       , int    , '\0'  ,  false   , 500   , 0  , 1000      , "max input numbers of LUT") \