The purpose of this study is to define the automatic triggering conditions for the national standard of the Automatic Emergency Call System (AECS) in China, and to standardize the test conditions to improve the efficiency and accuracy of emergency response to traffic accidents. The paper first studies of the current status of AECS-related standards abroad, proposing the basic principles for the automatic triggering conditions of AECS suitable for China, that is, the collision intensity required for AECS automatic triggering should not exceed the collision intensity required for the airbag to be fired. Through research on the airbag calibration strategies of domestic car and the collection of a large amount of real vehicle collision acceleration data, the collision dynamics in various directions were analyzed, the vehicle body motion characteristics were studied, and the data processing and statistical analysis were carried out. The acceleration waveforms of frontal, side, and rear collisions are determined, and the test acceleration corridors and velocity change parameters for the automatic triggering conditions in the AECS standard are defined accordingly. The results of the verification test show that the defined automatic triggering conditions are more sensitive than the United Nations (UN) standards, which can effectively improve the response efficiency of AECS.