Coastal Zone，in view of global change，is defined transitional zone between land and ocean. Coast zone very sensitive to fluctuation caused by various natural processes in broad area and anthropogenic activities and ecosystem balance is very fragil too. In order to develope the economy and predict human living environment，it is necessary to predict the impact of changes in climate，land use，sea level rise and anthropogenic activities on coastal environment and ecosystem and feedbacks from them. Therefore LOICZ study is very important.
  In our country coastal zone，which crosses three climate zones，there are many largerivers，and a huge sum of material fluxes，wide and broad continental shelf and strong exchange of materials and energy between continental shelf and nearby ocean，human intensive and frequent economic activities，which have altered coastal environment and ecosystem in a considerable degree，for example，coastal erosion and sea water intrusion caused by wantc;n exploitation of the sand and groundwater resources and sea level rise，fishing resources failling，water and sediment discharged from the large rivers decrease caused by climate change and water conservency works along the large rivers，these further affect the living resources，broad
mangrove had been broken and so on. The factors of global change and exploitation irregularly have affected in a great extent economic development and human living environment in coastal region，therefore，it is urgent to develop LOICZ studying.
  Based on the international operational plan of LOICZ and characters of coastal zone in our country，the strategy for studing LOICZ is“project large rivers,place to stay ecology,strengthen prediction and positive cooperation". The main scientific issuses are as follows:① To study and predict impact of global change and anthropogenic factors on the material fluxes.② To study and predict response of coastal environment and ecosystem to the change in material fluxes and the feedback to global environment.③To study transportation and transformation processes of materials emptied to sea from the land in estuary coastal sea and continental shelf and impact of them on the coastal environment and ecosystem.