i am going to China for an internship for 6 months in september. What Visa should i apply for?

Hi, Lucy! Since you want have multiple entries, I think it’s best to apply for a work Z type with the help of your boss. After your get the Z type, you are required to change it into a temporary residence permit within 30 days after your entry. Then with the residence permit, you can leave and enter freely without the need for applying entry permits.