diff --git a/venus-shared/api/market/method.md b/venus-shared/api/market/method.md
index dd7c17de23..fe9e41af27 100644
--- a/venus-shared/api/market/method.md
+++ b/venus-shared/api/market/method.md
@@ -134,7 +134,10 @@ Inputs:
   34359738368,
   {
     "MaxPiece": 123,
-    "MaxPieceSize": 42
+    "MaxPieceSize": 42,
+    "MinPiece": 123,
+    "MinPieceSize": 42,
+    "MinUsedSpace": 42
   }
 ]
 ```
@@ -561,7 +564,10 @@ Inputs:
   "f01234",
   {
     "MaxPiece": 123,
-    "MaxPieceSize": 42
+    "MaxPieceSize": 42,
+    "MinPiece": 123,
+    "MinPieceSize": 42,
+    "MinUsedSpace": 42
   }
 ]
 ```
diff --git a/venus-shared/types/market/assigner_type.go b/venus-shared/types/market/assigner_type.go
index 1529a80527..7aa4476ad5 100644
--- a/venus-shared/types/market/assigner_type.go
+++ b/venus-shared/types/market/assigner_type.go
@@ -30,8 +30,20 @@ type DealInfo struct {
 }
 
 type GetDealSpec struct {
-	MaxPiece     int
+	// max limit of deal count
+	MaxPiece int
+
+	// max limit of date size in one single deal
 	MaxPieceSize uint64
+
+	// min limit of deal count
+	MinPiece int
+
+	// min limit of data size in one single deal
+	MinPieceSize uint64
+
+	// min limit of total space used by deals
+	MinUsedSpace uint64
 }
 
 type DealInfoIncludePath struct {