To optimize the diagnostic factors of rheumatoid arthritis (RA) syndromes to achieve dimension reduction research of RA diagnostic information.Methods:To analyze clinical syndrome information of RA using such multiple statistical analyses as cluster analysis, logistic gradual regressive analysis, stepwise discriminate analysis, factor analysis, etc.Results:We have established optimal combination of the diagnostic factors of RA.Conclusion:The abovementioned combination has high diagnosis value for RA syndromes and the multiple statistical analyses applied have good dimension reducing capacity.