According to the matrix representation of quadric B spline surface,a sufficient condition of G~1 continuity between two patches of adjacent quadric B spline surface has been provided.

• 利用二次B样条曲面的矩阵表达式；将B样条曲面进行分片表示；给出了两邻接二次B样条曲面间的G1光滑拼接的充分条件.