Abstract: In order to understand the mechanical properties of concrete under different loading rates, we conducted uniaxial compression test on cubic concrete specimens (strength C15, side length 150mm) under different loading rates (10^-5/s,10^-4/s,10^-3/s,5×10^-3 /s). The test was carried out by micro-computer controlled electro-hydraulic servo static and dynamic multifunctional triaxial apparatus. The compressive strength of concrete under uniaxial compression, deformation, and stress-strain curve model parameters based on the statistical theory of modified Weibull were studied and analyzed. Results revealed that the modified Weibull strain curve model parameters well fit the complete curve model of concrete specimens under different loading rates. The strength hardening properties could be characterized by the values of parameter m and E in the Weibull constitutive model, and the strain softening behavior can be expressed by parameter c in the constitutive Weibull model.