At present,export of mainland China’s citrus is under pressure from the maximum residue limits of pesticides standard,especially the high standard of developed countries and regions,to a certain degree,restricts the export capacity of citrus in mainland China.This paper analyzes the current situation of flow and flow direction of mainland China’s citrus export:export of citrus in general shows the increasing tendency in the process of fluctuation; the intensity of export market is high,variety and export flow are short of diversity and huge trade risk exists; mainland China’s citrus export mainly flows to Asia and the occupancy rate in European and American markets is quite low.The comparision of importing citrus MRLs system among different countries and regions shows that the gap of maximum residue limits of pesticides of citrus between mainland China and developed countries and regions in testing types and testing standard is very large,which will easily results in technical trade barrier for mainland China’s citrus export.However,standard of residue limits of pesticides in developing countries and regions of southeastern Asia is slightly lower than that of mainland China,which to a certain extent,reduces the possibility of trade friction of mainland China’s citrus in these areas.Based on analysis of using the gravity model,this paper finds that standard of residue limits of pesticides in importing countries and regions has become an important obstacle which greatly influences mainland China’s citrus export trade.Consequently,this paper proposes several policy suggestions on how to neutralize such technical barriers:to build the citrus MRLs system joining up with international system,push forward the standardized production of citrus industry and establish perfect citrus MRLs warning mechanism. 