Hi MD Abdur Rahman
Greeting from Peggy, Top China Travel.
From my experience, if you mean the passport things, it may should be applied in your own country.
So do you mean you are looking for an agent to deal with Bangladesh Tourist Visa to China?
If you mean the visa application, we could not offer you the visa service, we only can offer the invitation letter for helping you to apply the visa.
But there are some conditions for you to get the invitation letter:
We only can send our invitation letter to the travel agent in your country, that means you need to join a group in your country
The group you joined must with 5 persons or above
And this link may let you more details about that
/customer-center/china-tourist-vis-for-sri-lanka-and-bangladesh.htm
peggy
Top China Travel