Visiting Hong Kong with a passport of the People’s Republic of China

I am an overseas Chinese currently living in the Philippines. I am holding a passport of the People’s Republic of China. I am planning to travel from Philippines to Hong Kong by plane for a day, and then to Guangzhou, China by train for three (3) days. Then travel back to Hong Kong for 5 days via train then return to the Philippines via plane. Do I need to secure a Hong Kong Visa or Hong Kong Permit Entry?