Abstract: Most prominent structure change of a tropical cyclone in its life span would appear in the period of its landfall process. Topographic forcing plays an important role for the tropical cyclone structure change when it's making landf all. Apart from the topographic forcing, structure change of a landfalling tropical cyclone also can arise from the interaction between the cyclone itself and some peripheral mesoscale vortices or a mid-latitude westerly trough. The structure change of a tropical cyclone of ten give rise to its intensity change, track turning and rainfall enhancement etc. On the other hand, the occurrence of most severe damages is due to those high impact weather such as high winds, heavy rainf all and strong storm surges associated with the landfalling tropical cyclones. Research community around the world at tach more importance to the area of tropical cyclone landf all process in last ten years.Several scientific field experiments related to those tropical cyclones in the coastal water or over land are being implemented in the different region of the world. The title and its acronyms are as follows: TOST (THORPEX Observational System Test) in the eastern coast of US, CBLAST (Coupled Boundary Layer Air Sea Transfer)-US, ATCCIP (Australia Tropical Cyclone Coastal Impacts Program),DOTSTAR (Dropsonde Observation for Typhoon Surveillance near the Taiwan Region), CLATEX (China Landfallling Typhoon Experiment).One of the common scientific objectives of those field experiments is to improve the tropical cyclone forecasting accuracy.