The online user innovation communities (OUICs) provide a platform for users to participate in innovation activities, share product experience, and interact with each other. Different types of users have different innovation values. Classification of users can facilitate better community management and maximize the value of users. In the existing user classification research, the analysis of user innovation value is not in-depth enough, and the professional knowledge of each stage of product development possessed by users is not fully considered, which is the key to maximize the value of user innovation. Therefore, we comprehensively consider the user’s innovation capability, professional capability, influence capability and active capability, and propose a measurement method of user innovation value (4C). And based on user innovation value, a framework of a three-dimensional user classification model (TIS) was proposed combined with the product development stages and topics that users participated in, which contains topics, innovation value, and stage. It can enable companies to introduce high-innovation value users with different professional knowledge backgrounds at different stages of product development, and give full play to their innovation value, which is conducive to improving the product innovation performance of companies.