In view of the problems of traditional evaluation index, such as impact factor, citation frequency and h-index, and taking into account of a series of principles like limited target, taking both quantity and quality into consideration, basic index optimization, time axis consistency, normal distribution data, and preventing artificial control, the author put forward a new bibliometric index, the influence index, so as correct the self-citation of cited frequency and impact factor, and then to sum up it after logarithmic normalization. Taking the CSSCI journal of library information and philology as research object, the research shows that the influence index is a good bibliometric index, which can be used to evaluate the short-term influence of academic journals. The correction coefficient of journal excessive self-citation needs to be further studied.