Objective To explore the relationship among the changes of five coagulation indexes and clinical stage,metastasis in pre-operative patients with gastric carcinoma,and to investigate the coagulation in patients with different clinical stages and its clinical significance.Methods Eight hundred and sixty-eight gastric carcinoma patients( carcinoma group) who were firstly diagnosed and 213 patients ( control group) who were diagnosed as inguinal hernia in the same hospital during the same period were enrolled.Levels of rothrombin time (PT),activated partial thromboplastin rime (APTT),fibrinogen (FBG),plasma thrombin time (TT) and platelet count (PLT)were observed and compared in these two groups.Results (1)Compared with health control group,PT( [ 11.51 ± 1.21 ] s vs [ 11.27 ± 0.91 ] s,t =- 3.226,P ＜ 0.01 ),FBG( [ 3010.0 ±470.4] mg/L vs [ 2307.1 ± 651.8 ] mg/L,t =- 4.240,P ＜ 0.01 ) and PLT ( 238.57 ± 78.50 ) x 109/L vs (206.79 ±61.01 ) x 109/L,t =-5.514,P ＜0.01 )were significantly increased in gastric carcinoma group.(2)PT,FBG and PLT were significantly different between control group and different clinical stages of gastric carcinoma group ( P ＜ 0.05 or P ＜ 0.01 ).The levels of APTF,TT exhibited no significant difference between control group and different clinical stages of gastric carcinoma group ( P ＞ 0.05 ).( 3 ) Compared with gastric carcinoma without metastasis group,preoperative blood PT extended significantly ([ 11.41 ± 0.99] s vs [ 11.57 ± 1.32 ]s,t =- 2.095,P ＜ 0.05 ),FBG concentration increased significantly ( [ 2639.1 ± 748.6 ] mg/Lvs [ 3233.2 ± 591.60 ] mg/L,t =- 2.307,P ＜ 0.05 ) and PLT count increased significantly ( [ 224.02 ±76.94] x 109/L vs [ 247.32 ± 78.37 ] x 109/L,t =- 4.299,P ＜ 0.01 ) in gastric carcinoma with metastasis group.(4) Correlation analysis on four coagulation and PLT count with clinical stage:PT ( r =0.071,P ＜ 0.05 ),FBG ( r =0.271,P ＜ 0.01 ) and PLT( r =0.166,P ＜ 0.01 ) were positively correlated with clinical stage of gastric carcinoma and TT( r =- 0.077,P ＜ 0.05 ) was negatively correlated with clinical stage,among the total,the correlation coefficient of FBS with clinical stage was maximum.Conclusion Most patients with gastric cancer present state of blood coagulation and bleeding tendency,particularly in advanced gastric cancer,and with increased clinical stage of gastric cancer,some coagulation indicators showing a rising trend.Detection of coagulation index indirectly indicates the incidence,invasion and metastasis of gastric carcinoma.