Abstract: Small modular reactor ACP100 adopts passive safety system and modular design technology and can be applied in district heating, seawater desalination and nuclear power ship, etc. The passive safety design mainly includes automatic rapid depressurization system, passive emergency core cooling system and residual heat removal system. For validation and verification of design features of the ACP100, a series of LOCA experiments were finished on a scaled integral test facility in Nuclear Power Institute of China. The system comprehensive response characteristics under DVI line break condition were obtained based on the experimental data. The influential patterns between systems were obtained and the core cooling effect was preliminarily evaluated.