The applica-bility of the fitting models is analyzed.The method for using bicubic splines or bicubic sur-face function to carry on the smoothing junction for two fitted subregions is presented.

• 对各种常用拟合模型的适用性进行了分析，幷提出了用双三次样条函数或者双三次曲面函数对拟合后的两个小区进行平滑连接，给出了相应的算法和精度评定标准。