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根据现拌和预拌混凝土的配制特点，分别拌制C10、C20、C30、C40等级的混凝土，在14 d和28 d龄期进行超声回弹和抗压强度试验，对试验数据进行回归分析和统计分析。结果表明：现拌和预拌混凝土超声回弹-强度曲线存在一定差异；差异的大小与混凝土的强度等级有关；在检测的混凝土强度等级较低时，应考虑到这种差异。“,”Undestmctive test of concrete is the important aspect in concrete quality control. On the features of field － mixed and ready－mixed concrete, the concrete of C10, C20, C30, C40 strength grades was compounded respectively. At the period of 14 and 28 days, ultrasonic－rebound tests and compressive tests were performed.Regressive and statistical analyses were carried out on the experimental data. The result shows there is fairly differences in two curves, which have something to,do with the concrete strength grades. It should be considered in examining the concrete of low strength grades.