Abstract: In 2004 in Sanmen Straits, Nanyang two, uses 5 broadcasts the time, 4 kind of densities two factors randomized block arrangement design. Studied week bean 11 in differently broadcasts under the time, the density condition the output constitution factor and the output change. The result indicates: In 20 processing, sow seeds by June 8th, the density is 262500/hm2 processing output is highest. But hundred grains heavy cofficient of variation is smallest in the output constitution factor, explains it is one correlation stable character.