The deal will give Uber a 20 per cent share in the combined firm, Bloomberg News reported, adding it will be valued at USD 35 billion.
Both companies have spent billions of dollars on subsidies for drivers and passengers, as well as trading vitriolic accusations, as they fought for dominance in the potentially lucrative market.
As reported, the structure of the agreement leaves Didi Chuxing in unquestioned control.
By "shedding its massive losses" in the country Uber will help clear its way to a future flotation, Bloomberg said.
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A blog post circulating on Chinese social media purportedly written by Uber CEO Travis Kalanick said: "I've learned that being successful is about listening to your head as well as following your heart."
Both firms were "investing billions of dollars in China and both companies have yet to turn a profit there", he added.
"Getting to profitability is the only way to build a sustainable business that can best serve Chinese riders, drivers and cities over the long term."
China-based spokesmen for both Uber China and Didi Chuxing did not immediately respond to requests for comment by AFP.
The new rules also said ridesharing platforms will be forbidden to operate below cost, possibly restricting their scope to offer subsidies.
Didi, which claims almost 90 per cent of the China ride-hailing market, said last month that it had recently raised USD 7.3 billion -- USD 1 billion of which came from Apple -- in one of the world's largest private equity financing rounds.
As part of the latest deal, Didi Chuxing will invest USD 1 billion in Uber, valuing the US firm at USD 68 billion, Bloomberg reported.