目的　分析结肠癌术前纤维结肠镜及结肠气钡双重造影在临床诊断中的应用价值。方法　对 41例结肠癌的X线、内窥镜直视下活检与术后病理诊断符合率进行对比研究。结果　X线诊断符合率 85 .4% ,内窥镜直视下诊断符合率 80 .5 % ,活检诊断符合率 84.6 %。结论　疑为右半结肠癌或疑为左半结肠癌伴有腹腔包块者 ,结肠气钡双重造影优于纤维结肠镜检查 ;对于仅有症状怀疑乙状结肠癌或有结肠息肉疑有息肉恶变的患者 ,纤维结肠镜应为首选。 Objective To analyze the value of preoperative colonoscopy and colon barium double colonography in clinical diagnosis. Methods 41 cases of colon cancer X-ray, endoscopic biopsy and postoperative pathological diagnosis consistent rate. Results The coincidence rate of X-ray diagnosis was 85.4%, the coincidence rate of 80.5% under endoscopy and the coincidence rate of biopsy was 84.6%. Conclusion suspected right colon cancer or suspected left colon cancer with abdominal mass, colon barium double colonoscopy better than fiber colonoscopy; only for patients with suspected symptoms of sigmoid colon or polyposis suspected polyp malignant patients , Colonoscopy should be the first choice.