I am at CAN airport i want go to 304 huanshi middle , Guangzhou by subway

Oh, you must refer to Middle Huanshi Road, right?
Upon landing, you can take subway line 3 at the airport, and get off at Jiahe Wanggang Station. Then transfer to line 2 to the railway station and take line 5 to Xiaobei Station, Exit B. The fare is CNY 7 per adult.
After arrival, walk to the southwest to find the destination.