Abstract: Serious disasters and risks are uncertain and destructive,which cause crisis in public administration and concern from society.Regional linkage of governments and the cooperation of different departments are essential in dealing with these disasters and risks.Based on the value of threshold,it is effective to establish a steady triangle regional linkage system to prevent the devastation.Classifying the theories of regional linkage,the authors illustrate and analyze the necessities and restrictive factors,and explore the way to establish the system.It is hoped that government functions could be optimized in order to deal serious disasters and risks efficiently.

Key words: serious disasters, public administration, regional linkage system, risks