The Aliyun unit will use the funds in part to set up cloud computing centres in Singapore and Japan, as well as in the Middle East and Europe, Alibaba said in a statement.
New York-listed Alibaba's Tmall.Com site is believed to command more than half the Chinese market for business-to- consumer transactions, while its Taobao platform holds more than 90 per cent of the consumer-to-consumer market in China.
"This additional USD 1.0 billion investment is just the beginning," Alibaba's chief executive officer Daniel Zhang said in the statement.
"Our hope is for Aliyun to continually empower customers and partners with new capabilities and help companies upgrade their basic infrastructure."
Alibaba offers business services to several companies through the Internet "cloud" including US chip giant Intel, Singapore Telecom (Singtel) and Hong Kong-based Towngas, the statement said.