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In order to comprehensively evaluate the crack resistance, a temperaturestress testing machine is used to investigate the anti-crack ability of dam concrete. Wetsieved dam concretes have been tested in semi-adiabatic conditions. The fulldevelopment process of the mechanical, thermal and deformation properties of concreteduring early age is monitored and testing time can be shortened dramatically by thetemperature stress testing machine. With comparing with single parameters tested bystandard methods and the testing data from similar research, it is concluded thatcracking temperature is reasonably adopted as direct evaluating index to effectivelycontrast the anti-crack ability of different concrete. The coefficient of linear expansion,which reflects the combined effect of autogenous shrinkage and thermal deformation,tested by TSTM is more useful for temperature stress analysis than the thermalcoefficient tested by standard method. This testing method has broad prospect in themix proportion optimization and crack resistance evaluation of dam concrete.