Abstract: Advanced secondary passive residual heat removal (ASP) system is one of the most important improving measures to cope with station blackout accident in the domestic second generation+ 1 000 MWe PWR nuclear power plant. In order to obtain the starting performance of ASP system, the ASP system test facility was constructed based on scaling criteria. The effects of different influencing factors on starting performance of ASP system were obtained. The results show that the secondary-side water inventory of steam generator and operating time of ASP system isolation valve have little influence on starting performance of ASP system. The flow rate of ASP system decreases with the increase of drag coefficient of steam pipeline and backwater pipeline. The flow rate of ASP system is unstable with reciprocating opening of vapor discharge to atmosphere valve (VDA), and it is recovered to stable state when VDA is closed. The peak value of flow rate of ASP system is mainly affected by the initial water volume of heat exchanger tube. The stable natural circulation is established during all the experiments.