An experiment imitated lacking seedling w as done for appraisal yield on none -blanch , less blanchesand more blanches varieties in soybean .The result of variance analysis showed that :There w as a same yieldlevel in the yield of plot betw een lacked 0 .098 m2 and CK in none -blanch varieties and less blanches varieties.There w as no difference in the yield among 0 .098 m2 , 0 .168 m2 lacked seedling area and CK in mo re blanchesv arieties .The equation between the yield and lacked seedling area fo r none -blanch varieties w as Y =747 .25x2+228 .21x -8 .9332 , R2 =0 .9975 ;Y =96 .574x2 +180 .14x -9 .135 , R2 =0 .9991 for less blanches variet iesand Y =149 .39x2 +60 .308x -1 .5213 , R2 =0 .9978 for more blanches varieties .