The germplasm resources are the base of fruit industry. They are very important on keeping species diversity, satisfying people's demands of high quality fruits and supplying fruit all year around, and also are the needs of innovating of agricultural science and technology and strengthening national power.This thesis includes 3 sections. Section 1: Research on fruit tree germplasm resources in the world, in which the significance of study on fruit tree germplasm resources, it's developing trend and the gene...