Effect size is not the fruits of the academic research, but also demonstrates the quality of the periodicals’ publishing papers, so the academic periodicals must standardize the description of effect size. Through analyzing the wrong and correct examples of effect size description, we take aim to solve the wrong description of effect size in academic periodicals paper. We suggest that editors, reviewers and writer must check up the effect size strictly, and through the cooperation of the three to complete the standardization of effect size. The paper provides an effective method for improve the quality of paper and affluences of academic periodicals.