By using simulated acid rain with different pH values compounded acco rding to acid rain appeared inChina , sensitive pH value of soy bean to acid rain tolerance w as determined , and it w as found that pH 2 .0 w as asuitable pH value for screening and identifying soybean germplasm resources rapidly , plentifully , and correct ly .Using this method w e evaluated 1033 accessions of soybean varieties f rom different places of China .Result sindicated that the number of g rade 1 for acid rain tolerance w as 68 accessions , and 6 of them had the st rongestacid rain tolerance .