Modular development is paid more and more attention to,which can bring distinctive advantages,but it also has some limitations,so the imminent question is how to utilize modularity equitably and make its merit maximum.This paper tries to survey modularity from modular product and modular organization.The paper analyzes the relationship of modular product,modular organization and innovation,measures the relationship of modular cost and modular profits and gives the essential conditions of modular development in the view of innovation.Then the modular analysis framework is built in order to provide theoretical direction for modularity practice.