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【目的】探讨超声检查对直肠癌术前浸润深度的诊断价值。【方法】80例直肠癌患者术前行超声检查，依据TRUS分期标准对其浸润深度分期，检测血清癌胚抗原（CEA）水平，与术后病理诊断结果进行对比分析。【结果】超声检查结果与术后病理诊断结果有良好的一致性，具有统计学意义（Kappa值＝0．847，P＝0．000）；术前超声检查总灵敏度＝88．75％（71／80），分期越高，术前超声检查结果越准确可靠；超声检查结果与术后病理诊断结果1、2、3、4各期的CEA水平均无统计学差异（ t ＝0．698，P ＝0．356；t ＝1．106，P ＝0．129；t＝0．546，P＝0．455；t＝1．367，P＝0．120），且呈显著正相关（ r ＝0．936，P＝0．000）。【结论】直肠癌术前行超声检查对直肠癌的浸润深度具有较高的诊断价值，可以作为术前的影像学检查手段，但仍应注意规范操作以降低误诊。“,”Objective]To explore the diagnostic value of re‐operative ultrasound for invasive depth of colo‐rectal cancer .[Methods]A total of 80 patients with colorectal cancer received preoperative ultrasonography , TRUS staging criteria were used to judge the depth of invasion and the serum level of carcinoembryonic antigen (CEA) detected .[Results]The results of ultrasound had an excellent agreement with pathological diagnosis (Kappa value=0 .847 ,P=0 .000) .The overall sensitivity of preoperative ultrasonography was 88 .75% (71/80) .The CEA levels of 1 ,2 ,3 ,4 phases of TRUS and pathological diagnosis were not statistically different ( t = 0 .698 ,P =0 .356 ;t =1 .106 ,P =0 .129 ;t =0 .546 ,P =0 .455 ;t =1 .367 ,P =0 .120) .And there was a strong positive correlation between them ( r=0 .936 ,P=0 .000) .[Conclusion]Ultrasound examination has a high diagnostic value for the depth of invasion in colorectal cancer .And it may be used as a preoperative imaging modality .