Although many experimental studies have confirmed the effect of family's cultural capital on educational achievement, evaluating the mechanism of its effect is controversial. The survey aimed at investigating the mechanism of evaluation quality into cultural capital impact on educational achievement. Using a survey method, this empirical study was conducted. In academic year 89-90, middle and high school students of Jovein Township were the population of the survey. By proportional stratified sampling, 369 students were selected as sample size. The results show that the parent’s cultural capital significantly affect the educational success of their children. However, the study findings did not significantly support the impact of evaluation causal mechanism on the children's educational success.