SRAP was used to analyse the genetic relationships 56 angular sponge gourds and 8 sponge gourds from different areas. 60 pairs of polymorphic and stable primers were screened form 144 primer pairs .A total of 1433 DNA bands were amplified，1280 of which were polymorphic.The average number of polymorphic DNA bands amplified by each primer pair was 21.33, and the ratio of polymorphic bands was 88.74%. UPMGA method was used to make cluster analysis,and result showed that the genetic similarity coefficient among 64 towel gourds germplasm ranged from 0.17～0.98. The tested species were classified into 2 cluster groups with the similarity coefficient of 0.17. The first group is sponge gourd, the second group is angular sponge gourd with two sub-groups including long green types and short cyan types. Classification and morphological traits of towel gourds are relatively consistent,namely, they are closely related to have ridges or not first, followed by fruit length and color.