Find an English audio recording and listen many times so you learn to distinguish the sounds of English. The speaking should be slow and clear. Films and television programmes are not usually appropriate for this purpose. If you have access to YouTube you can find a lot of videos which could be helpful.
Find a teacher or tutor on Italki or elsewhere who can prepare short listening exercises for you and help you work through them. Try out different tutors and choose one or two who are right for you.
You may be able to find a language partner : a native English speaker who is learning Chinese, to exchange language practice, or a learner of English who already speaks fluently. To improve speaking it is important that you practise with someone, a tutor or partner, who can correct your mistakes.