Abstract: Taking six peach（Prunus persica L.）varieties and eight crossbreed combinations of them（F1）as materials，photosynthetic characteristics，chlorophyll fluorescence characteristics as well as their heterosis and parent-offspring correlation were studied in September to investigate the inheritance of photosynthetic performance. The results showed that positive mid-parent heterosis and transgressive heterosis were higher on chlorophyll content，carotenoid content，water use efficiency（WUE），CO2 compensation point（CCP）and PSⅡ actual photochemical efficiency（Yield）of most combinations while negative heterosis were higher on net photosynthetic rate（Pn），light compensation point（LCP），light saturation point（LSP），light saturated net photosynthetic rat（LSPn），apparent quantum yield（AQY），CO2 saturation point（CSP），CO2 saturated net photosynthetic rat（CSPn），carboxylation efficiency（CE），electron transport rate（ETR），PSⅡ maximal photochemical efficiency（Fv/Fm）and non-photochemical quench（NPQ）. The behavior value of characteristics in F1 was less correlated with that of all parents except CSP and Fv/Fm after parent-offspring correlation. Meanwhile，the relative heterosis was correlated with different value between parents on carotenoid content，Pn，LSP，LSPn，CCP，CSP，CSPn and minimal fluorescence（Fo）. In order to breeding new variety of peach with photosynthetic superiority，proper differences between parents should be noticed.

Key words: Prunus persica L., photosynthetic characteristics, heterosis, parents-descendants correlation