Took Qinghai spruce (Picea crassifolia) in the small watershed of Pailugou in the central Qilian Mountains as the research object. From May to October 2018, the radial growth process of four strains of Qinghai spruce was measured using the belt tree radial growth recorder, and the meteorological factors were simultaneously measured. Based on the soil temperature and humidity, the seasonal variation characteristics of the radial growth of individual Qinghai spruce and the differences between trees were analyzed, and the limiting factors of Qinghai spruce in different growth stages were also determined. The results showed that:(1) The four Qinghai spruce plants began to grow on June 8 and ended on July 28, with a growth period of about 51 days. (2) The characteristics of the radial growth season of Qinghai spruce were different among individuals. The growth of trees with smaller DBH (DBH=10.0 cm and 11.0 cm) started later and ended earlier, resulting in the shorter growing period and less annual cumulative growth, while trees with larger DBH (DBH=18.3 cm and 21.0 cm) gave an opposite results, with a longer growing period and more annual cumulative growth. (3) The radial growth of Qinghai spruce had an obvious seasonal change pattern, which was divided into three stages:the initial growth stage (May to early June), the rapid growth stage (early June to late July) and the end growth stage (August to October) with the average growth rates of 0.35 μm/d, 12.99 μm/d and 0.54 μm/d respectively. (4) The limiting factors of Qinghai spruce growth were different among different growth stages:in the initial growth stage, rainfall and soil temperature were the main factors restricting growth, and during the rapid growth stage, rainfall and soil volumetric water content were the main factors. Therefore, from the perspective of the entire growing season, soil temperature and moisture were the main factors affecting the annual radial growth of Qinghai spruce.