Abstract: GFRP tube filled with steel reinforced concrete column consists of an outer tube made from glass fiber reinforced polymer (GFRP), steel reinforcement and inside core concrete. Tests were conducted with five specimens to study their bearing capacity under eccentrical load via a nonlinear analysis program based on the fiber model. The effects of strength of concrete, slenderness ratio, eccentricity and percentage of reinforcement on the mechanical properties of the eccentrically loaded columns were analyzed, with the relevant load-deflection relationship calculated. The results indicated that the bearing capacity of such composite members increases with the core concrete strength and percentage of reinforcement but decreases with the increasing slenderness ratio and eccentricity. Based on the analysis of calculated results, the formulae are given to predict the bearing capacity of the composite columns subjected to eccentric compression, which conform well with experimental results.