My English speaking ability is not really well, so I want to know the way to improve this ability. Thank you!
You may want to look at specific pronunciation courses, (there are many on Youtube. Just search "English pronunciation course"). Pronunciation can be difficult for speakers of Chinese learning English (and for English students learning Chinese). Just 5 mins a day of repeat exercises will rapidly make a difference.
I would look for students who want to learn Chinese and share skype (or any conferencing software) sessions.
I'd also recommend as a possible source of materials
https://learningenglish.voanews.com/ . They have quality materials based on current world activities. There are subtitles and voice overs at different speeds. Your speaking will improve the more you listen. And of course you can listen and then repeat. But the key thing is to find materials that are of interest and relevance to you. Generic course materials can easily kill your enthusiasm.
Saddened to see Taiwan in the news at the moment. My thoughts are with all involved.
I imagine you know much of this, but I hope there is something there that may prove useful.