In recent years,the relationship between the anomalies of surface latent heat flux and earthquakes has been a new subject of seismology study. It is a key problem that how to detect and extract the abnormal variation which is the result of seismic activities from the complicated latent heat flux varying background. In this study,by using the surface latent heat flux data of NCEP(National Center for Environmental Prediction),we discussed the SLHF anomalies prior and post to the Great East Japan Earthquake sequence. Besides,we also studied the relationship of earthquakes and SLHF anomalies of the study area in 21 years. The results suggest:(1)the SLHF variations which happened before the Great East Japan Earthquake were probably not anomalies,and they might not be caused by this occurrence;(2)there were many times "anomalies" which cannot find out any earthquake to be related to in this study area;(3)there were more than 60%earthquakes without any SLHF varying precursors;(4)related factors should be taken into account as many as possible to analyze relationships between SLHF variation and seismic activities;(5)we should investigate long time series data instead of focusing on individual earthquake event.