区域地磁场的时空变化研究是理解地球外核磁流体发电机过程的重要途径。其中卫星及地面磁测数据的获取及预处理，高精度三维区域模型的构建及误差估算，地磁长期变化数据的筛选及外源场干扰的移除都是需要面对的挑战。. 本研究针对目前存在的问题及研究基础，对于区域空间部分，拟利用最新的SWARM卫星数据、子午工程及地面台站数据，结合最新开发的三维曲面Spline模型，建立中国地区的三维地磁模型。建模时还考虑了地面与卫星高度的数据真空、边界效应等问题；对于时间部分，将所有可利用的中国地区地磁台站的长期变化数据，结合最新的全球模型进行区域地磁场长期变化分析，并通过特征值分析法移除外源磁层环电流的干扰，分析区域地磁场急变（jerk）情况，将结果与欧洲台站、地球日长变化（LOD）的长期变化相比较，分析区域jerk的全球特性及其与LOD的对应关系。将两者相结合以研究中国地区的磁场时空变化特征。

The study of spatiotemporal variation of regional geomagnetic field is the important way to deeply understand the process of MHD generator in Earth’s our core. Issues like the obtainment and pre-treatment of satellite data, the creation of 3D regional magnetic model with high quality, the selection and removal of external noisy from secular variation (SV) data series are challenges we have to face. .Based on current problems and foundation, to spatial part, this study is about to adopt the newest SWARM satellite data, the Meridian Project data, as well as the surface data, combine with the newest 3D Surface Spline model to derive an appropriate regional magnetic model that cover Chinese mainland. Meanwhile, the data loss between surface and satellite and the boundary effect are also considered; to temporal part, all available SV measurement data of Chinese observatories will be adopted, afterwards, we study the temporal variation of China associate with high quality global model. The external noisy (mainly the ring current exists in magnetosphere) will be removed by the reliable eigenvalue analysis method, then to investigate the geomagnetic jerk in recent couple of years. We compare our results with SV data of European observatories and the length of day (LOD) to inspect the Global characteristics of jerk and the possible relationship between jerk and LOD. Combine these two parts to study the spatial and temporal characteristics of magnetic field in China.