Entry&exit requirements for overseas Chinese going to Hongkong

I'm a Chinese residing in the Philippines. I'm a Chinese passport holder. In April, I'm planning to go to Hongkong for about 7-8 days then to Guangzhou, China for 7-8 days to observe the 2013 Canton Fair . I want to know what are the entry/exit requirements aside from an 'exit-entry permit for travelling to and from Hongkong'?