The photosynthetic physiological characteristic of zanthoxylum schinifolium in fruiting period was researched. The results showed that the light saturation point and light compensatory point of zanthoxylum schinifolium each was 500 μ mol/（m^2.s）and 55.59 μmol/（m^2.s）. The day net photosynthetic rate changing was a single apex curve, appearing at the 11：00 am. The net photosynthetic rate changed with the stoma conduction amount together, which indicated that the stoma conduction amount was the main influence factor of net photosynthetic rate.