Hindex is a mixed quantitative index, which can be used to evaluate the quantity and level of academic output of researchers. H index was put forward by george hill Shi, a physicist at the University of California, San Diego, in 2005.

H index, also known as H index or H factor, is a new method to evaluate academic achievements. H stands for "high citation", and a researcher's H index means that he has at most H papers cited at least H times. H index can accurately reflect a person's academic performance. The higher a person's H index, the greater the influence of his thesis. For example, someone's H index is 20, which means that 20 papers have been published, and each paper has been cited at least 20 times. Biologists' H index is on the high side, which shows that H index, like other indicators, is not suitable for interdisciplinary comparison.