Framework is a template for working program since framework consists of related classes and wired-in interactions among those classes. Reuse by framework is a promising way for improving the productivity and reducing the learning curve of new domain. So far, many efforts for developing the frameworks have been begun and a few real frameworks like CIM framework and domain frameworks were announced. We have a project for developing a framework in PDM (Product Data Management) domain. PDM can be applied to several application domains, but there are some little differences in each application. Developing the framework is not easy. In this paper we want to talk about the current states and results of our project: 1) the phases of developing our framework, 2) applying design pattern, 3) supporting environments for customizing the framework, 4) the problems in developing a framework