Abstract： Objective To study the diagnostic value of combined detection of four tumor markers [carbohydrate antigen(CA) 19-9,CA125,CA242 and carcinoembryonic antigen(CEA)] in patients with pancreatic cancer.Methods Serum levels of CA19-9,CA125,CA242 and CEA in 60 cases of pancreatic cancer,30 cases of benign pancreatic lesions and 30 normal controls were detected by radioimmunoassay. Results Serum CA19-9,CA125,CA242 and CEA levels in pancreatic cancer patients were significantly higher than those in normal controls and benign pancreatic lesions patients (P ＜0.05). If serum CA19-9,CA125,CA242 and CEA were detected simultaneously,the sensitivity and specificity of diagnosis of pancreatic cancer could be improved. With combined detection of CA19-9,CA125,CA242 and CEA in patients with pancreatic cancer,the sensitivity and specificity was 97.6% and 98.8% respectively. Conclusion Combined determination of serum CA19-9,CA125,CA242 and CEA can improve the sensitivity and specificity in diagonosis and differential diagnosis of pancreatic cancer.