Abstract: The regional joint defence of the local seismological work refers especially to the regional seismological work coordinated organization, which is established by a number of local seismological work departments distributed in accordance with the conditions of seismic disaster and usually cuts across several provinces (or cities) or prefectures in our country's continent, on a voluntary basis."THE JOINT DEFENCE COMMISSION AGAINST EARTHQUAKES IN HUAIHAI ECONOMIC ZONE" is established vohuntairlly by sixteen prefectures (or cities) in Jiangsu, Shandong, Henan and Anhui provinces in 1989, the purpose of which is to fight off the effects of seismic disaster when seismic activity enters into a new active period in our country's continent now.This paper put's forward a regional Joint defence work model through the reviewing and thinking of the establishment and management of "Joint Defence Commission", its characters, its main tasks and its workmode.This paper also generalizes the functions of the Regional Joint Defenee in coorperation, communication, stimulating and probing, It also puts forward six imagines and suggestions on the extant problems.