Aiming at the requirement of 3D reconstruction of big data in oblique photography, the incremental Structure From Motion (SFM) system is studied, and the traditional SFM system is modified. A highly efficient and robust linear incremental 3D reconstruction system is designed and implemented to solve the problems of low efficiency and inability to adapt to big data in traditional incremental 3D reconstruction systems, which provides a complete solution for 3D reconstruction of big data.