Abstract: It is a statistical analysis of the intestinal parasitic infection data of clinical patients during the years of 1981-2000 and the total infection rate is 30.89% (33607 positives in total 108795 persons), the percentage of intestinal worm infection is 78.14%, and the protozoal infection is 21.86%. Ascaris lumbricoides, Giardia lamblia, Hookworm, Trichomonas hominis, Taenia solium and Entamoeba are the major infective parasites. The trend of intestinal parasites in fection rate which is 46.61% in 1981 and 12.82% in 2000 is descending. Although the rate of intestinal worm infection has been descended slowly,the rate of intestinal protozoal infection presents a raising trend. There is a comparative vast change in intestinal parasites infection in last two decades,but there is no change in seasnal distribution.The infective rate is highest in third season of a year,and it is lowest in first season of a year.The result shows that the human intestnal infection rate is still at a high level,especially for the intestinal protozoan. So that it is necessary to do the prevention and treatment of intestinal parasites well considering the specific condition of season,parasites sorts,and the varions people groups.