采用平均影响因子、平均即年指数、平均IF百分位数和平均ImInd百分位数等指标，对2001年-2005年的9个学科领域596种OA期刊进行统计分析。研究发现，OA期刊的质量总体上处于中等偏上水平，但是存在学科差异。其次，OA期刊的质量稳步增长，并逐渐被科研人员所接受，已成为科研人员进行学术交流的重要工具。

596 open access journals from 2001 to 2005 in nine subject areas were statistically analyzed using Mean Impact Factor, Mean Immediacy Index, Mean Impact Factor Percentile Rank and Mean Immediacy Index Percentile Rank. Results show that the quality of open access journals was a little higher than the mean level on the whole,but on specific subjects there were greater differences. Secondly, the quality of open access journals was steadily increasing, and open access journals have been gradually accepted by the scientific researchers and have become an important tool for academic exchanges.