With the change of market and the rapid growth of the scale of the agency selling，the reseller will adjust the product strategy in time and selectively penetrate the market of agency selling so as to improve its own income and grab more market share in the hybrid retail platform. This paper attempts to explore the impact of reselling’s competitive entry threat on the sales revenue of agency selling，and how the agency selling will respond through price adjustment when faced with such direct product competition. Based on a set of trading data from a platform，we used the propensity score matching and difference-in-difference model for empirical analysis in this paper. Our results suggested that，first，the entry of reselling will cannibalize the sales revenue of the agency selling. Second，faced with the direct competition from reselling，agency sellers may choose to raise products’sale price. Third，market size of the agency selling will weaken the negative impact of reselling’s entry on the sales revenue of agency selling，however，it may enhance the positive impact of reselling’s entry on the sales price of agency selling. Through further supplementary studies，it was found that reselling’s entry would lead to the abandonment of the operation of some products by agency sellers，which may loss some of users as well. These findings not only expand the operation mode of two-sided platforms，the theory of inter-organizational relationship，co-opetition and entry，but also provide extremely beneficial practical guidance for the reseller and agency sellers in the hybrid retail platform.