Abstract: The cured shapes of cross-ply unsymmet ric composite laminates were investigated using Ritz method.An analytical model to predict the cured shape of unsymmet ric thin composite laminates was established based on thegeomet ric nonlinearity. The shape and deformation of the unsymmet ric composite laminates were obtained. It showsthat the predicted deformations are well agreed with the experiment s for the regions a lit tle far away from the edgesof the square plates and for the rectangular plates.