In this paper , the waterway curve plane function is established with move fit method to calculate the depth value of grid points , and in part fields linear method is adopted because of the distributing scrambling of waterway measure points . as a result of the use of two methods , not only the calculating precision is high but also the calculating speed is very fast 本文选用移动拟合法建立航道曲面函数，插值计算航道测量区网格点的深度值，并且根据航道测量点分布的不规则性进行了优化，即在测量点稀少的地方运用了线形内插法代替移动拟合法来进行插值计算，两种插值方法的合理结合，不仅保证了插值的精度，特别是提高了插值的计算速度。
