The time of working in China without any formal teaching qualification will becoming to an end in the next couple of years, at the moment in China you need no teaching qualification for visa applications to work in a school as a teacher. Some of the information I have seen in the Chinese papers points towards teachers needing a qualification recognized in their home country. To obtain a visa as a teacher you may soon need to be able to teach in the state system of your own country. For the UK this would mean holding QTS, America would mean you are state registered and the equivalent for Australians and Canadians. Having QTS means there are a lot of people in front of me who will lose their jobs first! Having QTS and completed my NQT/Induction also means I can return to teach in England at any time if required.