Hi Ma, I am a teacher and have been teaching for six years. I am also a language student too and have been learning Mandarin for about the same period of time. In my experience there are a few things that you can do improve your pronunciation and fluency. For pronunciation the first and most important thing to learn is how to make the sounds properly with your mouth. There are many sounds that exist in English which do not exist in your language. Some people can learn pronunciation just by listening and copying. These people are usually very talented! Most people, however, usually need to be shown how to make the sound. I know when I started learning Chinese, no matter how hard I tried I could never make the sounds: ji, qi, xi and yu properly until someone told me how to make them properly. This page will tell you common pronunciation problems that Chinese people have. http://englishspeaklikenative.com/resources/common-pronunciation-problems/chinese-pronunciation-problems/ This page can show you how to make all of the sounds with your mouth properly. http://soundsofspeech.uiowa.edu/english/english.html Once you understand how to make all of the individual sounds, you need to practise putting them together. Shadowing native speaker audio is a great technique to do that. https://www.youtube.com/watch?v=GVWFGIyNswI As far as fluency goes, well you need to practise as much as possible. I recommend language exchanges, hiring one on one teachers and talking to yourself (自言自语) when you can't find anyone to practice with. You can talk about what you can see in front of you, or even imagine having conversations with friends and family in English. Just don't do it when people are nearby. They might think you are a little crazy! :)