Heat exchange coefficient of gas in thrust chamber and distribution of gas temperature were obtained from Baz formula with data of thermal calculation

and the temperature of thrust chamber was calculated by finite element method.Based on calculation of temperature

the stress of thrust chamber was carried out by Wilson non-coordinated element

in which displacement function was quadratic form.The result shows that

compared with typical element

using Wilson non-coordinated element can get higher calculation precision and more reasonable result in the analysis of high temperature gradient and complex thermal structure of thrust chamber.