In order to further promote the construction of Alar eco-city and ensure the sustainable development of the city, this paper took the urban area of Alar city as the object of study, and selected four types of functional green land soil of the campus, municipal, residential and road greening areas to measure the soil water infiltration process by cutting ring method, and also the model fitting and analysis were made. It is found that there exist evidential differences in soil water infiltration between the four functional green land, and the stable infiltration rates are ranked as road green belt(0.31 cm/min) > campus(0.05 cm/min) > municipal(0.02 cm/min) > residential area(0.01 cm/min); Common infiltration models were adopted to simulate the infiltration progress, and the general model and Kostiakov model are the most suitable to describe the characteristics of soil infiltration in the green land of four functional areas, but the Philip model is not suitable to the study area. The research results provide a basis for soil green management in Alar city.