Objective To explore the new feature of colorectal carcinoma attack and its clinical significance.Method The clinical data of the 261 cases of colorectal carcinoma were retrospectively analyzed in our hospital examined patients(from 1990 to 1998).Results The morbidity of colorectal carcinoma was rapid increased with time progression ,in the former four years was 28 7% ,but in the latter four years was increased to 71 3%, former four years median of attack age was 54 years,latter four years was 63 years.they had differential histological typing and clinical manifestation.Conclusion The colonoscope technique is helpful to the early differential dignosis of the colorectal carcinoma and colectal inflammatory enteropathy.