The broad sense of transgression includes transgress, coast bank erosion and sea water intrusion.The sea water intrusion under ground on the coastal areas of Heibei Province has taken place mainly in the Haigang (harbour) District of Qinhuangdao city and the coastal areas of Funing county since 1979.The sea water intrusion under ground has covered over 55.4 km² and caused enormous local economic losses.The coastal erosion which would decrease the tourist resources has made the famous Beidaihe beaches to be steepened, narrowed and coarsened.The irrational human activities such as excessivly use of the groundwater, as well as the climate changes and hydrogeological factors are firmly believed to be the main factors which lead to the present transgression in the Hebei coastal areas.The forecast that transgression will intensify has been reached based on the synthetical appraisal of the coming climate changes, ground subsidence and the change tendency of water and silt flowing into the sea.