Partial multi-homing is one of new researching directions of two-sided markets.This article classified the types of two-sided markets based on characteristics of the behavior of users,and then considered a model of two-sided markets under the situation that competing platforms are different and users are partially multi-homing.The result shows that partial multi-homing decreases the price and profits of platforms,and the profits of platforms are highest when users single-homing,thus platforms have internal motivation to prevent users to be multi-homing.Differentiation between platforms increases profits of them.The results of this article are useful to enact pricing and competition strategies for two-sided markets enterprises,and also can be used to make policies of industrial regulation as academic evidence.