The citrus is the largest fruit crop both in China and USA,and citrus trade is an important part of Sino-USA agricultural product trade which has been significantly affected by the Sino-USA trade friction.The WITS-SMART model was used to simulate the impact on US-China citrus trade under two scenarios:US-China trade friction and citrus trade liberalization.The research finds that:(1) from the perspective of consumption,the impact on China consumer surplus and tariff income is obvious but controllable in the trade friction,but from the perspective of industry,the competitiveness of USA citrus in the China market has been severely frustrated,and exports have been significantly adversely affected; (2) from the perspective of the citrus industry,Sino-USA trade cooperation or even trade liberalization is the better choice for the USA and the scale of USA citrus exports to China increased by nearly 100 million dollars in the scenario of trade liberalization compared with in the scenario of trade frictions; (3) when substitution elasticity changes,the total citrus imports and consumer surplus indicators of the importing country remain unchanged,while the citrus imports from different markets and the corresponding tariff revenues change.It’s proposed to reduce trade frictions and promote trade liberalization which is mutually beneficial to the development of the citrus industry in China and USA.At the meantime,we should accelerate the cultivation of new citrus business entities and promote the commercialization and standardization of citrus in China to enhance export competitiveness.