Abstract: In order to research the genetic law of milking speed of filial generation of winter wheat,from three angles,for fifteen kinds of composed type of two parents milking speed we analysed genetic character and genetics parameter of milking speed and influence of different composed type of two parents milking speed to their filial generation and their close degree.At the same time we also had carried out analyse of path for the milking speed.The results show that the milking speed is a quantitative character and partial dominance.It has emerged the cell nucleus inheritance and evident phenomena of"tending to fast speed parent".The milking speed of filial generation must be acted on by their two parents’milking speed.Among them,rapid speed parent would play a leading role,but the slow speed parent also would play a restrict role.The less two parents’odds,the closer offspring-parents’relationship;the relationship between midparent of two parents’milking and their posterity are the closest of female parent and the posterity or farther parent and the posterity;but the relationship between farther parent and the posterity is closer than female parent and the posterity.The heritability of milking speed is high,so we should carry out individual othoselection in early generation,we will get the better selection result.If we want to increase the milking speed,we must pay more attention to selection of thousand grain weight the area of functional leaves the grain weight of individual plant,and meanwhile we should give consideration to selection of the time of milking,the amount of head of each plant,the amount of seeds of each plant.Make them coordinate development and synthetic raise.Syntheticaly analyse:this kind composed type is the best that the milking speed of two parents are fast,and its odds is less than medium,the rapid speed parent is farther parent.

Key words: Winter wheat, Milking, Genetic law