Meta-analysis is a statistical method to summary independent studies under the same subject. Hypothesis is the dependence of analysis. There are two hypothesis models:fixed effect size model and random effect size model. In fixed-model, it is assumed that there is a real effect size in all studies, and it is sampling error that leads to the difference among studies. In random-model, it is assumed that there is a random variable in all studies, which and sampling error are sources of the difference among studies. These tow models were introduced and real sample analysis was done.