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Abstract. In order to develop a new constructional material with super high strength and light weight, we did some studies on the mechanical behaviors of the new Modified Polymer Concrete (MPC). Seven kinds of experimental samples were made of fly ash and the special polyurethane, whose special mix-ration and producing methods were described in this study. The static mechanical properties were discovered in the compression test and the bending test. The mechanical behaviors of this new modified polymer concrete were also compared with that of concrete. The main results obtained in this study are: 1) the new material can be made of fly-ash and special poly urethane, 2) mechanical properties are discovered in the tests, 3) the new material can be used as the rapid strengthening material of reinforced concrete bridge, because it has large capacities of transformation, remarkable light weight, high strength and short curing time which is about 2 hours.