The component factor of yield in Jijing 66 and the simple connection, slanting connection to the yield and path coefficient were analysised. The results showed:The most important factor to yield in jijing 66 was the number of the ears of the grains per unit area; the second most important factor to yield was the number of grains per ear, while the function of the weight one thousand grains and blighted rate were little clearly. Especially blighted rate. So if we want to make Jijing 66 high yield, first we must raise the number of the ears and try to grow big ear of grains on the basis of enough number of ears. We see the influence from planting measure to each factor which interfered with yield, the function of fertilizer N dressed and planting ways were the most; Increasing fertilizer N and close planting can increase the number of the ears per unit area, so, It is the most important way to give enough fertilizer N（200～210 kg per ha） and then proper close planting（30.0 cm×13.4～14.4 cm）