Physiological parameter testing is the basis of clinical work. As currently used technical means，photoplethysmography(PPG)requires contact measurement and tests less measurement parameters.Because of the characteristics of non-contact and multi-channel detection，imaging photoplethysmography(IPPG)has attracted the attention of researchers and made rapid development.Firstly，this paper introduces the working principle of IPPG.Then，the representative research work is classified and summarized according to the key points involved in IPPG technology application,such as the signal acquisition site，image acquisition equipment，collection of physiological parameters and data processing algorithms.And the existing problems of IPPG application are also analyzed.Finally，the research direction of IPPG technology is proposed，such as the motion artifact elimination algorithm and the parameter diversification.This review provides a reference for the study and application of IPPG in the future.