What did china agree to do once the treaty of nanjing was signed?

The things that China Agree to do once the Treaty of Nanjing was signed are:  

-create a "fair and reasonable" tariff

-allow Britain to trade at five ports

-surrender the territory of Hong Kon

Explanation:

Treaty of Nanjing, (August 29, 1842) treaty that closed the first Opium War, the first of the complex treaties among China and outer imperialist powers. China paid the British a compensation, ceded the territory of Hong Kong, and granted to build a “fair and equitable” tariff.

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