The invention discloses a cost index analysis method, comprising the following steps: S1, establishing an index analysis rule base; S2: obtaining basic information and the general characteristics of a case project by a project management module and introducing an XML document of the case project; S3: with an index analysis module, matching a newly-built index project with the index analysis rule base, carrying out calculation to obtain a cost index analysis result of the a newly-built index project, and displaying an index analysis result file; and S4, outputting the cost index analysis result by an output module. In addition, the invention also discloses a cost index analysis system. With the system and the method, the efficiency of analyzing an index by the cost staff can be improved and index data sharing can be realized.