Qualitative evaluation and quantitative evaluation are two common ways of scientific evaluation research use both at home and abroad recently. We think that information philosophy provides theoretical support to qualitative evaluation and quantitative evaluation from the aspects of information intermediaries and information construction, and it is significant to scientific evaluation research method. Through discussion about the guide of information intermediary on indirect index evaluation, methodology of comprehensive scientific research evaluation that combines qualitative evaluation and quantitative evaluation is pointed out; on analysis of the relationship between information construction and subjective qualitative evaluation method, this paper thinks that we seek objectivity of subjective qualitative evaluation, which actually means the consistency among subjects, then hypothesis on how to use information construction to solve the reasonableness of subjective qualitative evaluation is brought up.