Abstract: Based on fiedl survey and located observation, the relationship between ecological conditions and spruce growth is analysed. The daily height growth of spruce is of continuous growing type, its growth at day time is higher than that at night, being146-279％. Height increment in June is 65％ of annual increment. The annual height increment depends on the heat and moisture conditions in June. In normal years, the height increment is greater, and less in reverse. The height growth of spruce is closely related to soil moisture content, which is lower at the top of dune than at its bottom. Spruce on sandy land is a shade-tolerant species, the height growth of its seedlings being accelerated under shady condition. After 20 years, the height growth increment is maximum with increasing age when light intensity is 45％.

Key words: Picea mongolica, Growth in height, Heat and moisture, Light factor