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目的： 探讨并殖吸虫中间宿主感染与其生态环境关系。方法： 选择福建省具有代表性地理地貌的卫氏并殖吸虫与斯氏狸殖吸虫流行区设点（ 村） ， 调查螺、蟹宿主感染及与感染相关的自然环境因素； 采检螺、蟹，以不同孳生环境螺的尾蚴阳性率与阳性蟹的囊蚴平均感染度进行比较。结果： 在岭阳村， 溪流型水流缓慢的Ⅰ段溪蟹的卫氏并殖囊蚴感染度为７２３９ 个／ 只， 比水流较急的坑沟型Ⅱ段溪的１４２６ 个／ 只高出５ 倍； 在溪口村，１９９６ 年放逸短沟蜷螺尾蚴阳性率与溪蟹卫氏并殖囊蚴感染度分别为４ ． ９ ％ 与１ ７３８３ 个／ 只， 比１９８２ 年的０２ ％与２０４７ 个／ 只分别高出２８９ 倍与８５ 倍； 在氵示上村， 常年渗水洼地流水浅水坑Ⅲ号沟拟钉螺尾蚴阳性率与溪蟹斯氏狸殖囊蚴感染度分别为４３ ％ 与３５５４ 个／ 只， 比同一水系的Ⅱ号沟的１ ％ 与４２９ 个／ 只分别高出４３ 与８３倍。结论： 卫氏并殖吸虫分布有一定的水系特征， 以水流缓慢小型水体处感染率居高。斯氏狸殖吸虫通常无明显水系分布特点， 而微型水体分布特征更为突出。适宜螺与蟹孳生的微型环境， 也是并殖吸虫完成其生活史循环适宜场所。对第一中间宿主的选择性及对生态环境的适应性，
Objective: To investigate the relationship between infection of paragonimiasis host and its ecological environment. Methods: Paragonimus westermani and endemic area of the genus Trichogramma collected from Fujian Province were selected to investigate the natural and environmental factors related to infection of snail and crab, The positive rates of cercariae in different breeding environments and the average infection rates of metacercariae in positive crabs were compared. Results: In Lingyang Village, the infection rate of Clostridium’siviridae in stage Ⅰ creek with slow flow was 7239, which was 1426 / Only 5 times higher; in Xikou Village, the positive rate of snail larvae in 1996 and that of C. cynocerus in 1995 were 4 respectively. 9% and 1 7383 个 per animal respectively, which were 289 times and 85 times higher than those of 02% and 2047 in 1982 respectively. In Xiangyun village, the perennial water seepage depression shallow puddle The positive rate of cercidipid coccidioidis of Ⅲ and that of C. cynocephalus were 4.3% and 3554, respectively, which were 1% and 429 more than that of No. Ⅱ furrow of the same water system Respectively, higher than 4 3 and 8 3 times. Conclusion: The distribution of Paragonimus westermani has some water characteristics, and the infection rate is high with the slow flow of water. The genus Trichogramma usually has no obvious distribution of water system, while the micro-water distribution is more prominent. Appropriate snails and crab breeding micro environment, but also paragonimiasis to complete its life cycle suitable place. The selectivity to the first intermediate host and adaptability to the ecological environment,