Pinduoduo, as an e-commerce platform, is very important for sellers to ensure product quality and reputation. To this end, Pinduoduo has implemented a deposit system to ensure the compliance operation of sellers and a satisfactory purchase experience. It is understood that the security deposit that sellers need to pay depends on the categories, brands, and shipments of the products they sell. Generally speaking, the amount of the security deposit is between several thousand yuan and tens of thousands of yuan. For some large brand merchants and high-traffic sellers, their deposits may be higher. It should be reminded that the deposit is not paid at one time, but is billed according to the monthly fee, and will be returned to a certain ratio after the order is completed. If the seller abides by the regulations of Pinduoduo and can handle the order in time, the deduction amount of the deposit will be reduced, and at the same time, he can gain more reputation and reputation, thereby improving the exposure of the store and sales.