Abstract: According to the global reconstruction algorithm of CT will take long time and be of low efficiency, this paper proposes the method of rapid and low resolution ratio analytic reconstruction for artifact firstly, then of visually selecting the region of interest, and finally using the ART algorithm to rebuild the ROI for high resolution. The experimental result for solid rocket engine shows that the algorithm saves a lot of time compared with global ART reconstruction algorithm in the case of the same resolution and the algorithm is beneficial to engineering practice.