When in Rome, do as the Romans do. When you stay in the city, you should have enough yuan -- China's official currency -- to maintain your daily expenses, rent, food, clothes and incidentals. Some people will say US dollars are accepted in some places here. It won't be convenient for you to live your life depending on US dollars. You'll constantly be looking for somewhere to exchange your dollars for yuan. Except some hotels, resorts or places only for foreigners, you cannot use US dollars or other foreign currencies directly in the city.
You can exchange the currency over the counter at some banks in the city. Of course, you can use your credit cards in most of the Huaian shops, but groceries (bought in grocery stores), rents or other bills will be collected in cash.
As a financial center in China, or even Asia, Huaian has a lot of banks and financial companies, both domestic and overseas, which may offer you a series of financial services. Their branches are available all around the city.
Retail branches and ATMs
Branches, sub-branches and ATMs are everywhere in the city, especially in downtown. You will easily find a dozen in the area where you live. If you use bank cards, you can deposit or get cash in yuan everywhere and any time in the city. Some will charge fees for the services.
You can get the address of the specific branches or ATMs of your favorite banks from their official Websites, Google local guidance or just by dialing the customer service hotline.
To transfer money gained here to your home country is a technical job. You should seek help from law firms or accounting firms. First of all, you should obey Chinese laws. In some conditions, a foreigner needs to pay tax and some service charges. It's better for you to make a plan with help from a lawyer or accountant on your money transfer project.
Click here for the official Website of China's State Administration of Foreign Exchange, which rules your money transfer from Huaian to your designated place. An English version is available.