Abstract: The embryonic development of Pomoxis nigromaculatus were observed continuously, and the effects of water temperature on the embryonic development were discussed. The experimental results showed that hatching time was 40.23 h at the water temperature (24±1)℃. The Values of Q10 of embryonic development of Pomoxis nigromaculatus was 2.05, and the suitable temperature range for fertilized eggs hatching was 22℃~24℃. There was a negative correlation between water temperature and hatching time. The regression equation between temperature and hatching rate: y=25.899x-0.5 407x2-216.92（R2=0.9 217）; the regression equation between temperature and abnormality rate: y=0.5 496x2-22.857x +236.44 (R2=0.9 422); and the biological zero point of Pomoxis nigromaculatus was 10.22℃, the effective accumulated temperature was (545.14±22.60)~(554.42±22.74) ℃?h.