Based on the phenology observation data of Haloxylon ammodendron and Cornulaca alaschanica from Wuwei meteorological bureau of Gansu Province,by using the methods of linear trend estimation,stepwise regression and variance analysis,the key phenology'climatic forecast models were set up. The results showed: (1) The temperature dropped slightly and precipitation increased in desert area over the past decade. The phenology of Haloxylon ammodendron was stable,the phenology latest appeared day differed from earliest 14 to 26d. The phenology of Cornulaca alaschanica changed greatly,the phenology latest appeared day differed from earliest 40 to 142d,and the phenology of Cornulaca alaschanica was more sensitive to climate change. (2) Haloxylon ammodendron' s turning green period,leaf expansion period,shoots formation period,flowering period and withering period of interannual variation tendency rate was 1.1 ~ 5.3d/10a,the phenology slightly delayed in recent 10 years. Cornulaca alaschanica turning green period,inflorescence formation period,flowering period and withering period of interannual variation tendency rate was 10.8 ~ 17.3d/10a,the phenology delayed in recent ten years,and the variable rate was larger. (3) The spring bud period of Haloxylon ammodendron,the vegetative growth period,the reproductive growth period and the whole growth period were all prolonged. The vegetative growth period of Cornulaca alaschanica was shortened,and the reproductive growth period and the whole growth period were prolonged. Accoeding to the influence of ≥0℃ accumulated temperature and total precipitation on the desert plants,Haloxylon ammodendron is a thermophilic drought tolerant plant,and Cornulaca alaschanica is largely affected by precipitation. (4) The temperature and phenology of Haloxylon persicum was significant negative correlation,the temperature was higher in spring,the spring phenology of Haloxylon ammodendron was advanced. The autumn temperature was higher,the autumn phenology was postponed. Precipitation in March to June and and phenology of Haloxylon ammodendron was significantly positive correlation,the more rainfall was, the more the phenology of Haloxylon ammodendron was postponed. The temperature and the phenology of Cornulaca alaschanica was significantly positive correlation,the temperature was higher,the phenology was later. When the water condition was suitable for the growth,the phenology of Cornulaca alaschanica would appear. The high temperature and drought were not suitable for the growth of Cornulaca alaschanica.