When you want improve english vocabulary, you must take time and practice with it. Because it cannot build within an hour or a day. Firstly, you should practice active vocabulary building. You should read more a book, write the vocabulary that you don't know, speak and listen english words. And you should keep a dictionary with you bacause when you don't understand the meaning of the word, you can find at that time. Because it is good way to learn and remember new vocabularies. Secondly, you must practice passive vocabulary building. It is other way to improve english vocabulary such as listen music, watch movie, or learn words in every place. Finally, you must memorise and use a new words in correct context. When you have learnt a new word, you should review it by write, find the meaning and see the sentence of the word. And then you should use that word every day in correct context and review it until you can memorise it all. If you don't review, you will forget it. Therefore, reading, speaking, writing and listening can help you a lot to improve your english vocabulary.