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应用层析成象反投影方法，对华北地区28条深地震测深剖面Pg波走时进行处理，作出了该区结晶基底速度及时间项成象。并作了方法的数值模型合成数据的敏感性分析，证明所采用方法的有效性及成象结果的可靠性。计算中应用LSQR算法求解大型稀疏超定方程。并采用只存储矩阵非零元素技术，使存储量减小到原矩阵的百分之一，同时零元素不参加计算，提高了运算速度。华北地区结晶基底速度为5.9～6.35km／s，时间项最大为2.0s。
Based on tomographic backprojection method, the Pg wave traveltimes of 28 deep seismic sounding profiles in North China were processed, and the imaging of the crystallization velocity and time terms in this region was made. The sensitivities of the numerical model synthesis data were also analyzed. The validity of the method and the reliability of the imaging results were proved. LSQR Algorithm Applied to Solve Large - scale Sparse Overdetermined Equations in Calculation. And only the storage matrix using non-zero element technology, the storage capacity reduced to one percent of the original matrix, while the zero element does not participate in the calculation, improve the speed of operation. The basement velocity of crystallization in North China is 5.9 ~ 6.35km / s and the maximum time is 2.0s.