我国农村有1．56亿劳动力进入非农业生产，到本世纪末，我国农村剩余劳动力达2亿多。这些剩余劳动力将涌向城市和经济发达地区[1]。K．E．Mott报告，世界上一些国家因动乱使流动人口达到了难以想象的数量，以致对血吸虫病的传入、散播和加剧难以进行监测。在索马里的埃塞俄比亚 There are 156 million rural labor force in China’s non-agricultural production, by the end of this century, China’s rural surplus labor force reached 200 million. These surplus labor force will flock to cities and economically developed areas [1]. K. E. Mott reports that it is difficult to monitor the spread, spread and intensification of schistosomiasis in some countries in the world as a result of unrest in unimaginable numbers of migrants. Ethiopia in Somalia