The move, announced today, is an extension of Wal-Mart's pact with JD.Com, China's no. 2 e-commerce site.
New Dada, partly owned by JD.Com, has more than 25 million registered customers and delivers to more than 300 cities.
China is a key growth market for Wal-Mart, potentially lucrative but challenging.
The world's largest retailer has increased its stake in JD.Com to 10.8 per cent, following an initial deal that gave JD.Com ownership of its Chinese e-commerce site Yihaodian.
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