Abstract: How to analyze and assess the knowledge sharing risks in an organization is studied. The main factors which form knowledge sharing risks are found out through analyzing earlier works in combination with questionnaire/statistics, thus building dimensionally an evaluation index system for such risks. The system includes the risks arising from organization/structure, organizational culture, key personnel and knowledge/technology, etc., the four dimensions. According to the index system and the uncertain information on evaluation indices, a method based on evidential theory is proposed to assess knowledge sharing risk with an example given to show its application.