本文分析了日本血吸虫中国大陆株的染色体组型,结果表明其染色体数目单倍体为8(n=8)二倍体为16(2n=16),核型组成是;大型染色体4个,中型染色体6个,小型染色体6个,可配成8对,按大小次序排列,第1、2、3、4、5号为亚端部着丝粒染色体,第6、7、8号为亚中部着丝粒染色体,根据染色体的大小、形态和着丝粒的位置,可将日本血吸虫中国大陆株的染色体分为三组,即Ⅰ组(第1～2号染色体),Ⅱ组(第3～5号染色体),Ⅲ组(第6～8号染色体)。其中第2号染色体为性染色体。 In this paper, the genotypes of Schistosoma japonicum in Chinese mainland were analyzed. The results showed that the number of chromosomes was 8 (n = 8), the diploid was 16 (2n = 16), the karyotype consisted of 4 large chromosomes, 6 chromosomes, 6 small chromosomes, can be dubbed 8 pairs, arranged in size order, 1, 2, 3, 4 and 5 for the sub-end centromeric chromosomes, No. 6, 7, According to the size, shape and centromeric location of chromosomes, the chromosomes of Schistosoma japonicum in Chinese mainland can be divided into three groups, namely group Ⅰ (chromosomes 1 ~ 2), group Ⅱ (chromosomes 3 ~ Chromosome 5), group III (chromosomes 6-8). The second chromosome is sex chromosome.