1. IMMERSE yourself in English. Try to think English whenever and wherever. In your mind, try to say expressions that you use everyday in English. 2. TALK to people who know English. Italki is a good website for the same. Just add language buddies here. Teach them Chinese and learn English from them. Add them on Skype and try to have a conversation. Everyday you will improve. 3. READ, simple things at first and slowly progress into tougher stuff. Start with children's books if you are really uncomfortable. You will never even realise how fast you will be improving your english. 4. LISTEN, to songs, videos, shows and anything that make your ears attuned to catching English words. The toughest part of a language is to understand what the native speakers speak. Sine the words flow at an amazing pace, it is difficult to distinguish between words. But slowly, it will become a habit. These will make you get used to listening to the language and hence will attune your brain to better speak, read, write and think in english :)

It's really difficult, even people with excellent english usually have some kind of accent. The best way to avoid the interference of your native language is to be in contact with english all the time, like in an exchanging program, but when that is not possible, you should try to be in contact with the language as often as possible, watching movie, tv shows, listen to music, everything that could make you have contact with native and fluent speakers. I hope that this could help you. Good luck.