在当前多种地磁日常数据处理方法基础上，探讨提高地磁观测数据精度的问题。通过使用一种改进的地磁观测基线值计算方法，能有效减小外磁场变化对观测结果的影响，考虑到基线值日变化等因素，使用高阶多项式拟合基线值日变化曲线。利用该方法处理的地磁数据与实测数据进行结果比对后，发现此方法能有效提高地磁观测数据的精度和质量。

  Based on various geomagnetic daily data processing methods being used, we analyzed how to improve the precision of geomagnetic observation data. Using the improved calculation method of geomagnetic observation baseline values, can effectively reduce the influence of external magnetic field changes on the observational results.  Through further analysis of the baseline value variation and other factors, we can use high order polynomial fitting to obtain baseline values variation curve.  By comparing this method processed geomagnetic data and the measured data, it is found that this method can effectively improve the precision and quality of geomagnetic observation data.