Abstract: Chooses the seven jing rice variety in huanghuai region, We analysis the correlation and the path index, establishing the regression equaion, the result show: The first factor of affecting spikes per 667m2, the second is number of grain per spike, the stair branch affect yield through the number of grain per spike;the plant tall and the length of spike are minus correlation to yield, that show the chife vareities in huanghuai region are the short stem,small ear, the super variety will be tall stem ,resist fall, big ear and more graines, when spikes per 667m2 is ensured.