Because the shape and dimensional stability of bent wood products will affect applied prospect and product quality of bent wood,shape and dimensional stability was studied to ensure product quality of bent wood.A curvature reversion test of bent wood products was done at different temperature process.It was compared curvature reversion ratio that the wood was processed at temperature of 100,140,160,180 and 200 ℃ for 2,4,and 8 hours,then for another process soaking for 24 hours at 20 ℃,soaking for 4 hours at 60 ℃,and soaking at (100 ℃) boiling water for 1 hour.The results show that the set recovery of radius of curvature increases as the heat treatment times decreases,and decreases as the heat treatment temperature increases.It is submitted a correlative theory of dimensional stability of bent wood products and it is also submitted a method of how to improve dimensional stability of bent wood products.