I want to find a part-time job between 6 pm and 10, in Nanchang.

Glad to help you. You can find it in some shopping malls, supermarkets, restaurants and other places in Nanchang. These places generally need night service personnel. You can check whether there is a suitable position for you in the staff recruitment section. In addition, you can also search for relevant job information on the recruitment website, such as "Nanchang Evening News", "Nanchang Restaurant" and other keywords, to find a position that suits you. Good luck!