Different digestive tract reconstruction will affect the blood glucose level of gastric cancer with type 2 diabetes. Subtotal gastrectomy with Billroth II reconstruction and total gastrectomy with Roux-en-Y reconstruction may help to improve glycaemic control which includes fasting blood glucose, postprandial blood glucose, glycosylated hemoglobin, C -peptide and body weight of gastric cancer patients with type 2 diabetes.

Different digestive tract reconstruction will affect the blood glucose level of gastric cancer with type 2 diabetes. Subtotal gastrectomy with Billroth II reconstruction and total gastrectomy with Roux-en-Y reconstruction may help to improve glycaemic control which includes fasting blood glucose, postprandial blood glucose, glycosylated hemoglobin, C -peptide and body weight of gastric cancer patients with type 2 diabetes.

The investigators will observed fasting blood glucose, postprandial blood glucose, glycosylated hemoglobin, C -peptide and body weight of the patients preoperation, 14 days postoperation 3 month and 6month postoperation. The investigators will observed the effect of blood glucose to different digestive tract reconstruction after gastrectomy of gastric cancer with type 2 diabetes

Inclusion Criteria:

1. 18-75 years old,gastric cancer ,can be performed operation
2. with type 2 diabetes,fasting blood glucose > 6.1mmol/L
3. without serious underlying diseases which may affect the metabolism and nutrient uptake
4. without serious underlying diseases which may affect anesthesia and operation
5. can be performed subtotal or total gastrectomy, predicted survival period > 6months
6. no other abdominal operation
7. preoperation consultation
8. informed consent

Exclusion Criteria:

1. recurrent,metastasis or die
2. patient requests for quit
3. pregnancy

gastric cancer with type 2 diabetes,18~75 years old,without serious underlying diseases