Daily variations of net photosynthesis rates (Pn) of 6 tree species in red soil under Pinus elliotii forest were determined and their relation with environmental factors were analyzed using path analysis. The daily courses of Quercus acutissima, Schima superba, Castanopsis fissa and Lespedeza bicolor showed unimodal curves, with the maximum of （1982±266）, （1458±179）, （1611±482）, （1492±367） μmol/（m2〖DK〗·s） at 11:00 am, and Adinandra millettii, Photinia davidsoniae presented bimodal curves, with the maximum of （891±181）, （1085±163） μmol/（m2〖DK〗·s）. The sequence of daily average of Pn was Q. acutissima >S. superba > C. fissa > L. bicolor > A. millettii > Ph. davidsoniae, and significant differences were found among Q. acutissima, S. superba, C. fissa and A. millettii, Ph. davidsoniae (p＜005). Based on pathway analysis, Pn was mainly influenced by vapor press deficit (VPD), temperature (T), relative humidity (RH) and photosynthetic active radiation (PAR) for Q. acutissima, C. fissa and L. bicolor. While S. superba was mainly influenced by VPD, T and PAR. Whereas for A. millettii and Ph. davidsoniae
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