The article is a discussion for calculation method of base-line values of declination in Lhasa GeomagneticObservatory and has some results.
通过对拉萨地磁台磁偏角基线值计算方法进行讨论，得到了有益的结果。
2
According to the observation data at Guangzhou geomagneticobservatory from 1958 to 1995, we summarize the laws of the geomagnetic secular variation in Guangzhou geomagneticobservatory.