Abstract: Knowledge base has been widely using in enterprises and customer service organizations. Evaluating the construction effectiveness of knowledge base is very important. It plays a key role for enterprises in determining the success or failure of the program related to knowledge base construction and providing guidance to improve and maintain knowledge base dynamically. On the basis of several earlier works relevant to the evaluation methods, a framework for evaluating the construction effectiveness of knowledge base is presented and the corresponding evaluation process is given. An example is given to illustrate the practicability and application value of the proposed framework and process.