In this study, we use difference in difference (DID) method which compares the treatment and control groups in order to strictly evaluate the effect of the introduction of Agricultural Products Processing Center(APC) on the marketing margin of fruits. It is estimated that the marketing margins of apples, pears and citrus have been reduced by 135.5 won/kg on average due to APC. Considering that the APC intends to reduce distribution costs and increase the producer price, the analytical results of this study indicate that the APC construction project has achieved its policy goal.