SRM snowmelt runoff model is a typical representative of empirical models. It was proposed by Swiss scientists martinec and Rango in the early 1980s. It has been tested and applied in more than 100 watersheds in more than 20 countries. Due to the simplicity and high accuracy of SRM model, scholars have carried out in-depth research and achieved more results. Rango has modified the parameters of SRM model for many times, so that the model can be more widely extended; Brubaker corrected the improper extraction of degree day factors; Im merzeeel and others used the SRM model to study the impact of climate change on Asian water tower; SRM has been widely used to study the impact of climate change on Asian water tower In the Ganges River Basin, it is found that the model is not limited by basin scale and height, which indicates that the model can not only be applied at small watershed scale. Domestic scholars focus on SRM Ma Hong applied the model to Gongnaisi River Basin in the Western Tianshan Mountains and achieved good results, which showed that the model had a good application prospect in the inland arid areas of Western China; Feng Xuezhi used the improved SRM model to simulate the daily discharge of Manas River Basin; Wang Jian focused on the study of GIS and remote sensing data in Alps mountain watershed The key parameters and factors in SRM model are selected.
