In recent years, many cities have been broadening the scope of housing security, in order to safeguard low income families, by increasing the low income cut-off and by lowering the thresholds of application for housing security. Firstly, an empirical analysis on the implementation effect is applied in this paper focused on the expansion of low-rent housing security policy in Guangzhou. Secondly, the existing problems during the expansion policy implementation is also concluded in this paper from perspective of working style, effectiveness, security standard, and application experience of residents. Finally, possible suggestions are proposed in this paper for improving the low-rent housing security policy in Guangzhou, in the mean time, providing the reference for the setting and implementation of the expansion of low-rent housing security policy in other cities.