Germplasm resources is very important to the modern breeding and the study of biotechnology. The research on genetic relationships of germplasm resources can provide scientific basis for exploring the origin, evolution, classification, breeding and application of peach germplasm resources. The research advances in genetic relationships of peach germplasm, including the morphologic, cytology, palynology, biochemistry and DNA molecular markers, were reviewed in this paper. The actuality, prospect and urgent problems of peach germplasm resources were also discussed. To further study the genetic relationships of wildness, sib wildness and cultivar groups of peach, we may resort on genetic markers and DNA sequence analysis in addition to morphological characters.