Taking the international OA(Open Access) journals of China and USA as an example and combining traditional citation indexes and introducing the Altmetrics indexes, this paper constructs a model of impact evaluation and comparison and constructs an evaluation index system of OA journals from two dimensions of academic influence and social influence. Through standardization, correlation analysis, reliability/validity analysis, factor analysis and two-dimensional analysis, the academic and social influence of OA journals are evaluated and compared between China and
USA. The authors found that:（1）In terms of academic influence and social influence, the evaluation scores of international OA journals are quite different between China and USA. The influence of American international OA journals is far greater than that of Chinese international OA journals.（2）There is a strong positive correlation between the 7 traditional citation indicators based on JCR, and a high positive correlation between the 8 Altmetrics indexes based on Altmetrics explorer, and the indexes have a significant consistency both overall and internally.（3）There is a moderately positive correlation between academic influence and social influence scores of 66 OA journals. The evaluation of academic influence of OA journals is a useful supplement to the evaluation of social influence. Finally, suggestions are put forward to enhance the influence of Chinese international OA journals.