Tor bridge seems to be blocked in China. I cannot use the bridge to connect to the Tor network directly in China. I can only bypass the blockage and use Tor by using a VPN.
Have you tried using WebTunnel?
WebTunnel doesn’t seem to be integrated into Tor Browser by default 
Thank you for your feedback!
You need to get a WebTunnel bridge from bridges.torproject.org and copy and paste as a new bridge.
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Access bridges.torproject.org
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Copy the bridge and paste on your Tor Browser Connection settings (
about:preferences#connection):
if you can’t download tor because the website is blocked,you can found some mirrors of the download page here :
In China, all obfs4 bridges (including the one I built) are blocked and cannot be connected. Please fix this problem. Thank you.
@antsir, did you try with WebTunnel bridges as mentioned earlier on this thread?