Symmetry of price fluctuation of agricultural products is one of the criterion of judgment for the marketization degree of agricultural products and symmetrical and full market information. The asymmetric transmission of agricultural products price fluctuation not only affects the traditional symmetrical transmission theory,but also makes the non-equilibrium distribution of the welfare of the relevant subject in the policy meaning. Based on the intensity,velocity,direction and ups and downs of asymmetric transmission in price fluctuation of agricultural products,this paper first points out the impact of price asymmetric transmission and problems that the governments should attach importance in making agricultural policies,then briefly summarizes the research instruments of price fluctuation asymmetric transmission and analyzes the practices of asymmetric transmission in such typical markets as dairy,meat and vegetables both at home and abroad. Finally this paper points out several problems which should be paid attention to in the analysis of Chinese agricultural products market as well as the prospects for the future research.