In this paper , the approach of rapd was used to study 57 species of crickets , which belong to 26 genera , 7 families , in order to discuss their taxonomy status and gentic relationships in molecular level , and enrich the research of molecular systematics in grylloidea . the genome dna of the 57 species were extracted by the method of proteinase k isolation of total dna 蟋蟀总科的分子系统学的研究也主要集中在个别种种内或种间mtdna多态性方面及个别种同工酶的研究上，而利用rapd技术进行蟋蟀基因组dna多态性方面的研究在国内外更少，国外仅见chu ， j
