According to the relation of center point and neighboring points, a novel method is put forward using dynamic programming and grey relational analysis to find a best seam line.

The basement shows characteristics of trichotomy, that is, "T" type intersection of two hidden deep faults may be the stitching line among Yanliao, Luxi and Taihang basement.

To counter the splice problem of digital terrain model (DTM) the paper puts forward the algorithm of cutting out of splice line to triangle network.