提出了一种新的实用薄膜结构裁剪分析方法———分片展开法。该方法采用测地线对结构曲面进行划分 ,用文中提出的平面映射法对各曲面膜片进行平面展开计算 ,并引入回缩比系数以考虑膜内预拉力的释放和徐变影响的消除。编制了相应的裁剪分析程序 ,并对该程序进行了算例验证 Proposed a new practical thin film structure analysis method - slice expansion method. In this method, the geodesic surface is divided by the geodesic. The plane map method is used to calculate the plane expansion of each curved surface, and the shrinkage ratio coefficient is introduced to consider the release of prestress and the elimination of creep effect. The corresponding cutting analysis program has been compiled, and the program has been verified by examples