Abstract: Software measurement tools are used in software development processes in order to improve software quality. As OO languages are becoming the mainstream programming languages, the requirement of measuring software written in OO language is emerging. But there are large numbers of OO languages and many of them are still changing. Besides, different users might want different metrics. All of these challenge the design of measurement tools. In this paper a flexible and generic architecture is given and its advantage is discussed. Based on the survey of OO languages and OO metrics, the kernel of this architecture and the structure of the intermediate representation are analyzed in detail. At last the characteristic and feasibility of the architecture are summarized.