Abstract: After investigating kernel weight per plant and their correlation of six agronomic characters （Height,Stem number, Fabric length,Ball number, Seed number per ball and Kernel weight per plant） of thirteen linseed lines,the regression method was used to select the variable by every step,and then got thirteen linear regression equations.Different linseed lines had different characters that had been chosen to take path analysis during the choosing steps.And that indicated their relationship and contribution to yield.The results were as follows： ball number,height and seed weight per plant had a significant correlation with the individual yield.Different eharaeters play the critical role in the kernel weight per individual in different linseed genotypes.