Randomly put 400 25-week-old laying hens into 5 groups. Upon stalbe egg production, we conduet an experiment by adding Ns2SO4 water with different degree of 1.2 g/L, 0.9g/L, 0.6g/L, 0.3g/L, Og/L. The result shows: feed conversion and laying rate of 4 hen groups fed with Na2SO4 water are higher than that of the check group; when adding Na2SO4 water with degree of 0.6g/L. its feed conversion and economic benefits reach the best eondition.