Yes! When visiting Khan Academy's homepage (https://www.khanacademy.org/) in China, everything should function correctly. Because YouTube is blocked in China, we use a different video player to show the instructional videos.
If you're looking for localized Chinese content, you can visit (https://zh-hans.khanacademy.org/) for a translated version of the site.
You may be able to access the KA Lite site from Iran instead of our full site.