To further study the compatible working performance between steel bar and engieering cementitious composite (ECC), the eccentric compression behavior of steel bar reinforced ECC columns is systematically ana- lyzed in this paper. Firstly, the constitutive model of ECC material is simplified to analyze the mechanical prop- erties of the member under eccentric compression through numerical integration. The research results show that the theoretical and the measured results agree well, which verifies the reliability of the proposed method. Then, based on this method, the effects of steel reinforcement ratios, load eccentricities, and ECC compression strength on the mechanical properties of columns under eccentric compression were analyzed. Finally, the load carrying capacity (N_u-M_u) relation curve of R/ECC columns was compared with that of the steel reinforced concrete (RC) columns, which shows that the Nu-Mu curve of R/ECC column is fuller than that of RC column, indicating high- er safety performance of R/ECC columns.