Abstract: Effects of surface grass covering technology on soil water and heat conditions, physicochemical properties, lily growth, and yield in cold and dry lily planting areas were investigated．Using a randomized block design, experimental treatments were open field, surface grass covering, and plastic film covering, with 3 replicates for a total of 9 treatments．Results showed that surface grass covering technology of lilies could significantly improve soil water and heat conditions, increase content of soil physical and chemical properties indicators, and increase yield of lilies．Compared with open field treatment, surface grass covering treatment increased surface soil temperature and moisture content by 18.86% and 2.23 percentage points, soil organic matter by 0.31 percentage points, alkaline nitrogen, available phosphorus, and available potassium content by 18.12%, 21.04%, and 10.41%, respectively．Plant height, stem diameter, ball horizontal diameter, ball vertical diameter, bulb weight, and yield increased by 8.26%, 22.22%, 16.55%, 23.47%, 32.83%, and 35.07%, respectively．In cold and drought lily planting areas, surface grass covering technology is an important field management measure．