In this study, the temporal variation and spatial distribution characteristics of geomagnetic total intensity in mobile geomagnetic observation were analyzed using the mobile geomagnetic observation data from Hebei province between 1986 and 2009; in addition, the characteristics of mobile geomagnetic anomalies were discussed. The results show that there is a certain relation between the mobile geomagnetic changes and earthquakes in the area. The precursory anomalies usually appear 1~2 years before the earthquake. The δ_F value has the variation characteristic of "continuous sharp rise-impending sharp decline." The bigger the magnitude the larger is the geomagnetic anomaly. In this study, only M_L ≥ 4.0 earthquakes occurring in the monitoring area can reveal seismic change information that can better predict the earthquake.