Now,i have a question about google,our site has changed anything about keyword,design in recent days,and i can not find my site in google when i use our keyword,and what should i do now?Build backlinks?
What is the url and keyword you are chasing ? By the way, there is an error with the way you have done the 1st link in your sig file.
recently, it changes a lot, my website has the same problem, submit to google again and find more links with other websites.
Did you have an account with google webmaster tools and if so, you can have an idea on the number of pages indexed, top search queries etc...
Tryo get some blog reviews done. I saw immediate increase in traffic due to the log reviews. But it will cost you money. If you are short on budget, try doing manual directory submission or social bookmarking
Its normally take a few days to get back site in the results. Not need to be take any tension be cooooool
If you provide us your website url maybe we can help trying to find the reason, because sound strange.