This paper constructs a new evaluation index named after sensitivity, and makes an empirical analysis based on the relevant literature data. It is found that the connector ‘and’ can reduce the sensitivity of retrieval results more than ‘or’; In terms of sensitivity, to improve the accuracy retrieval rate, the "title" item should be retrieval priority. The combination with "summary" items or single retrieval can benefit for the improvement of search recall ratio. The findings of this research,which based on the assessment of sensitivity of the retrieval, are expected to benefit the researchers who focusing on the systematic review and meta-analysis to conduct research synthesis related research.