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The shear strength equations for the RC column-steel beam joint are those proposed by various institutes, but their applicability is limited to be applied to various joint details. Those equations were derived from the tests by each individual institute and until now no further efforts have been attempted to extract the general equation which could predict the joint shear strengths accurately. The purpose of this study is to investigate statistically those equations with 49 experimental results. The equations selected are ASCE, Kanno, M-Kanno, AIJ, M-AIJ and Lee. From the statistical analysis, it was found that ASCE equation may underestimate joint strengths with about 42% error but AIJ and M-AIJ equations were considered as improper. Equations by Kanno and Lee showed very high correlation. However, most of the equations showed low correlation for the specimens with transverse beams. Lee's equations showed very high reliability with the Cronbach's alpha coefficient over 0.77. Therefore Lee's equation was considered to be used properly for predicting RCS joint shear strength.