Abstract: High temperature injures flowering-fruiting of early rice in the productive practice. This experiment was carried out in phytotron to study the influence of the different degrees of high temperature on the flowering-fruiting process of early rice during the flowering stage. It was found that with the increase in temperature the peak of daily flowering appeared earlier; the maximum rate of daily flowering, the rate of the total number of flowering, the rate of bursted anther and the number of filled grain decreased; the rates of unopened floret, night-opened floret and unfilled grain increased. The most sensitive stage of a floret to high temperature is just before flowering and its resistence to high temperature greatly strengthens at the time inmediately after flowering and pollination when the elongation of ovary becomes visible. The cause of high temperature injury is due to the destruction of fertilization process resulting in the formation of empty grains.