Abstract: This article approaches the impact of water-heat complex factor to yearly ring from its growth in desert region．It is obtained by calculation： 1．the index K of water-heat has the obvious sensibi-lity information cont- ent and restrictive factor，and linear correlation biologically；2．the wate- rheat index of yearly ring growth has the obvious retarded feature and continuity，3．the index of water-heat has different long period and short period；4．after the square difference simulation，the future K value will be lower than the average value period in 1988-1993；higher than the ave- rage value period in 1994-1998；and after 2000，will take a tendency of increase。