Internet censorship in the People's Republic of China is conducted under a wide variety of laws and administrative regulations. In accordance with these laws, more than sixty Internet regulations have been made by the People's Republic of China (PRC) government, and censorship systems are vigorously implemented by provincial branches of state-owned ISPs, business companies, and organizations.
The Golden Shield Project is part of what is sometimes known outside of mainland China as the Great Firewall of China. It is used to block and filter out many websites. So how do you find out if your website is blocked by the Great Firewall of China?
China Channel Firefox Add-on
You can use China Channel Firefox add-on to find out if your website is blocked or not. You can experience the censored Chinese internet at home. From the project webpage:
The Firefox add-on China Channel offers internet user outside China to surf the web as if they were in China. Take an unforgetable virtual trip to China and experience the technical expertise of the Chinese Ministry of Information Industry (supported by western companies). It's open source, free and easy.
Install China Channel Firefox Add-on
Grab add-on here
Install and restart Firefox.
Click on Tools > China Channel > Manage Proxies To setup proxy > Click on the OK button in the popup window to finalize the installation process.
Select "CHINA CHANNEL" and click "GO", you will get connected through a random proxy server in China now.
Now can browse net via china based proxy server. Try to visit your website and see if it is blocked or not: