diff --git a/tools/t7.py b/tools/t7.py
index e08904e..36cc3f8 100644
--- a/tools/t7.py
+++ b/tools/t7.py
@@ -35,6 +35,8 @@ class AutoLayout:
 
         # 记录每个芯片数量大小
         self.chip_size = dict()
+        # 含N端芯片数量大小
+        self.chip_size_N = dict()
 
         # 记录芯片barcode, i7, i5 barcode信息
         self.chip_barcode_recode = defaultdict(set)
@@ -285,6 +287,10 @@ class AutoLayout:
 
         if newer:
             self.chip_size[chipname] = library_data['size']
+            self.chip_size_N[chipname] = 0
+            if 'N' in library_data['data'][0]['barcode']:
+                # print(library_data['data'][0]['barcode'])
+                self.chip_size_N[chipname] = library_data['size']
             # if library_data['classification'] in ['扩增子', '不平衡文库', '单细胞文库以及甲基化']:
             if library_data['is_balance_lib'] == '否':
                 self.chip_speciallib_size[chipname] = library_data['size']
@@ -313,6 +319,10 @@ class AutoLayout:
             if '华大' in library_data['classification']:
                 self.chip_speciallib_huada_size[chipname] += library_data['size']
 
+            if 'N' in library_data['data'][0]['barcode']:
+                # print(library_data['data'][0]['barcode'])
+                self.chip_size_N[chipname] += library_data['size']
+
     def use_rule(self, chipname, classfication):
         may_classfic = set(self.rule[self.rule['c1'] == classfication]['c2'])
         if self.chip_customer[chipname].intersection(may_classfic):
@@ -331,14 +341,19 @@ class AutoLayout:
         约束条件
         """
         size = library_data['size']
+        size_N = 0
+        if 'N' in library_data['data'][0]['barcode']:
+            size_N = library_data['size']
         classification = library_data['classification']
         customer = library_data['customer']
         is_balance_lib = library_data['is_balance_lib']
+        library = library_data['library']
 
         # 芯片大小不能超过设定限制
         sizelimit = True
         if self.chip_size[chipname] + size > self.data_limit:
             sizelimit = False
+            # print(chipname, library, '芯片大小不能超过设定限制')
 
         # barcode有重复
         notrepeatbarcode = True
@@ -348,27 +363,32 @@ class AutoLayout:
                 self.chip_barcode_recode[chipname].intersection(
                     {item['i5'] + 'N' * 8 for item in library_data['data']}):
             notrepeatbarcode = False
+            # print(chipname, library, 'barcode有重复')
 
         # 互斥的文库
         exclusive_classific = True
         if self.use_rule(chipname, classification):
             exclusive_classific = False
+            # print(chipname, library, '互斥的文库')
 
         # 互斥的用户
         exclusive_customer = True
         if self.use_rule_exclusive_customer(chipname, customer):
             exclusive_customer = False
+            # print(chipname, library, '互斥的用户')
 
         # 不平衡文库大于250G 不能添加
         splibrary = True
         if is_balance_lib == '否' and self.chip_speciallib_size[chipname] + size > 250:
             splibrary = False
+            # print(chipname, library, '不平衡文库大于250G')
 
         # 甲基化文库不能大于250G
         # 甲基化更改成100G
         spmethylibrary = True
         if is_balance_lib == '甲基化' and self.chip_methylib_size[chipname] + size > 100:
             spmethylibrary = False
+            # print(chipname, library, '甲基化文库不能大于100G')
 
         # 不使用不平衡文库的判断
         if not self.is_use_balance:
@@ -384,11 +404,18 @@ class AutoLayout:
             ratio_sites, is_not_balance_list = self.count_barcode_radio(current_data)
             if is_not_balance_list:
                 base_balance = False
+                # print(chipname, library, '碱基不平衡')
+
+        # 含N端的数据量不超过 上面设定碱基不平衡的900G的一半
+        sizelimit_N = True
+        if self.chip_size_N[chipname] + size_N > 450:
+            sizelimit_N = False
 
         # 华大的文库不能超过限制的一半， 华大的数据就不能再加
         use_huada = True
         if (self.chip_speciallib_huada_size[chipname] > self.data_limit / 2) and ('华大' in classification):
             use_huada = False
+            # print(chipname, library, '华大的文库不能超过限制的一半')
 
         # 开启i5或者i7
         if max_barcode != 'all':
@@ -425,7 +452,8 @@ class AutoLayout:
                 base_balance and \
                 spmethylibrary and \
                 use_huada and \
-                notrepeatsublib:
+                notrepeatsublib and \
+                sizelimit_N:
             return True
         return False