Abstract: The survey is to test weed control effect which use of the three kinds of soybean field post emergence herbicides in soybean seedling chemical weeding.The test show that,the prevention and control effect：compared with 10% Imazethapyr add 25% Fomesafen,the prevention effect of 13.6% Sanxiongdi Microemulsion,20.8% Putianna EC is better,can achieve the significant standard.Soybean production：compared with 10% Imazethapyr add 25% Fomesafen,the production of 13.6% Sanxiongdi Microemulsion,20.8% Putianna EC is much better.