Abstract: In this paper, the phenological change of woody plants (Salix mantsudana and Sophora japonica)in the east Hexi Corridor during the period from 1980 to 2004 was analyzed after carrying out the step regression and variance analysis using the expansion correlation and SPSS software. The effects of meteorological factors on phenological change and their correlations were investigated. The correlations between phenologcal stages and temperature, precipitation and sunshine were significant. The results are as follows: (1) The phenological change trends were that bud opening and leaf expansion stages became earlier, the linear trend rate varied in a range of -0.110 8--0.356 2; the stages of bloom, leafcolor change and defoliation were postponed, and the linear trend rate varied in a range of 0.479 2-0.710 8; (2) The analyzed results of phenological plastochrones revealed that the greenleaf stage, growth stage, dry matter cumulative stage and autumn growth stage of woody plants were prolonged for 1.046-7.738 d/10 a, 0.877-8.454 d/10 a, 4.392-7.738 d/10 a and 0.477-3.015 d/10 a respectively; (3) There was the negative correlations between the phenological stages of woody plants and spring temperate, the phenological stages became earlier when spring temperate was increased; there was a positive correlation between the phenological stages and autumn temperature, the phenological stages were postponed when autumn temperate was increased. There was a significant positive correlation between precipitation and bloom and defoliation. But the correlation between sunshine and biological properties was different from different growth stage. The effects of environmental factors and biological mechanism were coupling. Change of phenological stages of woody plants brought a series of chain reactions in local ecological environment.

Key words: phenological stage, climate change, woody plant, Salix mantsudana, Sophora japonica, Hexi Corridor