Using the geomagnetic total intensity daily variation in minimum time ( low point time) information， we analyzed the geomagnetic low-point displacement phenomenon before 4 moderately strong earthquakes in Heilongjiang and its adjacent areas during 2008 ～ 2011，and discussed the phenomenon mechanisms． The preliminary results showed that the low-point displacement phenomenon and the occurrence of moderately strong earthquakes in this region have a certain relevance and has some reference value on short-term and impending-earthquake prediction in Heilongjiang Province and its adjacent areas．