with senegalese passport,i am in guanzhou i want to go at hong kong,taiwan and back to guangzhou

You need a visa to HK, you can send your visa application to the Immigration Section of the Office of the Government of the Hong Kong Special Administrative Region in Beijing, or send it derectly to Hong Kong Immigration Department at:
Receipt and Despatch Unit, Immigration Department,
2/F, Immigration Tower, 7 Gloucester Road, Wan Chai, Hong Kong.
If you will go back to Guangzhou, make sure you have valid visa and entry on your China visa.