Abstract: The effect of ply angle declination on deformation of a curved composite laminate with varied thickness has been studied in this paper.The resources of ply angle declination were drawn.was caculaled with a model in which thermal expansion and curing shrinkage was considered.The cure deformation of the composite curve laminate.The caculated result is conformed with experiment test,showing the calculation model is approvable.By using the uniform design,the design of experiments was achieved when the ply angle declination with in 5 degree of each ply angle.The regression was used to analysis the result of the design of experiments,which shows that in general,ply angle declination has few effect on cure deformation,relatively the ply angle declination of-45 degree has more effect on cure deformation than ply angle declination of 90 degree does.