Abstract: Effects of post-harvest cold storage and Modified Atmosphere Package on fruit hardness(FH), weight losing(WL) and soluble solid content(SSC) of different peach or nectarine varieties were investigated. The results showed that: (1) There were obviously differences of fruit hardness among varieties of different flesh types. In room temperature, FH of ‘24-30’ and ‘Zhongtao No.2’ went down slower than ‘Zhongyoutao No.5’ and ‘Zhongyoutao No.10’. In cold storage, ‘24-30’, FH of Zongyoutao No.5’ and ‘Zhongyoutao No.10’ descent quickly after 2 weeks of storage while that of ‘Shuguang’ and ‘Zhongtao No.2’ quickly descent just after storage. (2) MA package could effectively slow down the decreasing of FH. There were obvious differences among different varieties while ‘Zhongyoutao No.10’ was less sensitive than others. (3) Soluble solid content went down after harvest and the procedure was slower in lower temperature. In room, MA package seems accelerate the descendent of SSC. This may result from that the package could prevent the diffuse of heat and promote the respiration. (4) The WL was obvious after harvest and the cold storage could greatly slow down it. There were some differences between different types of varieties.