The sorghum hybrid Jiza 319 with its female sterile line 515 A and its male restorer line 501 R were used as test materials planted under the same environmental conditions. At the flowering stage, Pn, Gs, Ci, Tr of leaves were measured by Li-6400 photosynthetic parameter measurement system, and WUE and AMC were calculated.The difference of photosynthetic parameters between Jiza 319 and its parents was analyzed. The results showed that Pn, Gs, WUE and AMC in leaves of hybrid Jiza 319 were significantly higher than those of its female sterile line 515 A and its male restorer line 501 R, and were 7.88%, 10.11%, 8.93%, 18.05% higher than that of their parents, respectively（P ＜ 0.05）. Pn, Gs, WUE and AMC in leaves of Jiza 319 had significant heterosis. Ci was significantly lower than that of its female sterile line 515 A and male restorer line 501 R, while Tr in leaves of hybrid Jiza 319 was not significantly different from that of its parents. The results showed that the the photosynthetic parameters of sorghum hybrid Jiza 319 had significant heterosis, and its photosynthetic metabolic capacity was significantly higher than that of its parents, which laid a physiological foundation for its high yield.