Chinese currency is called Renminbi (people's   money), often abbreviated as RMB.
                              
                              Travelers Check
Travelers checks are the best way to carry money around in China, the exchange rate is fixed and it can be replaced if lost or stolen. Checks can be cashed at the major branches of the Bank of China.
The Bank of China offices or exchange counters accept traveler's checks issued by international commercial banks or traveler's check companies in more than 100 countries and regions, including USA, Canada, Hong Kong, Japan, UK, France, Switzerland and Germany, etc.
Credit Card
Major credit cards like Visa, Mastercard, Diners Club and American Express are useful in major tourist cities too. They can be used in most mid range to top range hotels, and some big department stores and restaurants. You can get cash advances in the head branches of the Bank of China. The Bank of China has an ATM network that will allow cash advances from major credit / debit cards and ATM cards.
Although the acceptance of major credit card is now more   widespread in large hotels, restaurants and stores, it is unwise to rely on   credit cards. Many stores and restaurants do not accept credit cards yet.
                              
                              Money Changer
Money exchange   facilities for both currency and travelers' checks are available at major   airports, hotels, and department stores. Please note that hotels may only   exchange money for their guests. 
                              
                            The US dollar, British pound, French franc, German mark, Japanese yen,   Australian dollar, Austrian schilling, Belgian franc, Canadian dollar, HK   dollar, Swiss franc, Danish Krone, Singapore dollar, Malaysian ringgit, Italian   lira, Macao dollar, Finnish markka, and Taiwan dollar are all exchangeable.   Exchange rates fluctuate in line with international financial market condition   and are published daily by the State Exchange Control Administration. 
Keep your currency exchange receipts because you will need to show them when you change RMB back to your own currency at the end of visit to China. Cash rather than credit cards is essential in remote areas and you should ensure that you carry sufficient RMB and travelers' checks to cover your requirements.
Currency Regulations
There is no limit on the amount of foreign currency and foreign exchange bills that can be brought into China by tourists, but it must be declared to the customs.
RMB should be converted back into foreign currency with the   personal valid "foreign exchange certificate" before leaving China. Unused   foreign exchange and RMB traveler's cheques can be taken out of the country.   Each tourist is permitted to take with them less than 6000 RMB.
                              
                            If you will do business in or with China, you are advised to hire a local assistant to help you learn more and do well for your business and travel in China. 
                            
                            
      
      More China Travel Tips:
Accommodation
Bargaining Tips
Clothing
Embassy
Dealing With Emergency
Etiquette
Chinese   Food
Money   Issues
Shopping in China
Tipping   Practice
Transportation
Visa Application
Business Culture 
Negotiations
Business Meeting
Making Contact