Post-embed pullout tests are applied to the concrete cubes of C15-C60. Based on the result of 50 concrete samples, the relationship between pull-out resistance and compressive strength of concrete has been discussed in detail, and the formula used for calculating the concrete strength is given out. Its related coefficients and relative standard can meet the requirement. The simulation method is used on the base of curving failure surface. The paper presents the destruction mechanism of pull-out method in concrete property test, and good correlation between the date of pullout force and cube strength is explained.