Well, to be honest, Lyly, the best way to help you improve your listening skill is to encourage you to help yourself... and that is by doing a LOT of listening to genuine English, on a regular basis, focusing on topic areas that you personally find interesting.
I highly recommend the World Video News discussion thread in this forum, where you will find a lot of Reuters video news articles.
Basically:
1. Try to listen to a new article every day
2. Don't panic or give up if you don't understand everything you hear
3. Use the video images to assist your comprehension (it's even a good idea to watch the video first with the volume turned down to help you absorb the situations presented)
4. Do multiple listenings - first listening, just try to catch the general idea, second listening, try to note 3-4 main ideas, third and any other listenings, try to add as many details as you can to the main ideas
5. Think about and respond to the article. Give your opinion about it. By responding to the article, you are creating a "full circle" involving input and output (in speaking or writing). Ask other forum members for their opinions about the article, or respond to their comments about it. Get interactive!
6. Above all else, be patient - you need constant exposure on a regular basis to make improvement in your listening ability (it won't improve drastically in just one day or even one week)
I hope those pointers give you something to think about!
Best,
~ Jason