Taking 6 residential areas in Nyingchi of Tibet as research objects, from aesthetic effect, ecological function and leisure service, this paper established the evaluation indicator system for plant landscape in residential areas using AHP, and calculated the weight of indicators using the judgment matrix. Besides, it calculated the ideal solution and closeness degree of matrix using TOPSIS, and established the evaluation method and preference method for plant landscape in residential areas. The results show that the indicators of seasonal variation, environmental benefit and per capita green space mattered most in the landscape evaluation of residential areas. The richness of flowering plant is weak in the landscape evaluation. From the comprehensive evaluation of residential areas, Nyingchi Garden District and Xingfu District have excellent plant landscape, Jialong Garden District and Shangcheng Garden District have general plant landscape, and Sun City District and Niyang Garden District have poor plant landscape.