The value of online sales in China exceeded half a trillion yuan in the first half of 2012, a result in part of aggressive discounts offered by e-commerce companies to attract customers.

Shoppers spent 511.9 billion yuan ($80.39 billion) online in the first six months of the year, 46.6 percent more than in the same period a year earlier, according to a report by the China e-Business Research Center, a market analysis company based in Hangzhou, Zhejiang province.

Experts said e-commerce companies will continue to offer low prices to attract customers in the second half of the year.

In July, Tmall.com, which arranges sales between businesses and consumers, said it would provide 1 billion yuan in subsidies to sellers and buyers in the last six months of 2012, the third such subsidy it has announced in three months.

That offer came on the heels of various steps e-commerce companies took from April to June to offer prices that are lower than their competitors'. Some companies, such as Beijing Jingdong Century Trading Co Ltd, offered shoppers large discounts.

"E-commerce companies can gain a bigger market share by initiating price wars," said Mo Daiqing, an e-commerce analyst with the China e-Business Research Center.

"And it's also a way to attract potential investors and retain users."

Wu Sheng, senior vice-president of Beijing Jingdong Century Trading Co Ltd, which runs the e-commerce site 360buy.com, said the company plans to maintain its policy of offering low prices in the second half of the year.

"I don't think having a price war is really a central part of e-commerce," he said. "It's just a response to the fact that most online shoppers are very aware of prices."

China was home to 214 million online shoppers by the end of June, up 23.7 percent year-on-year, the report said. It predicted the number will increase to 273 million by the end of the year.

Mo meanwhile said attempts to keep prices low could eventually harm the e-commerce business. While that practice helps attract shoppers, it also places a strain on companies' capital reserves.

Jingdong, for example, reported a net loss of more than 1 billion yuan last year, double the amount of the year before.

Even so, it had the second largest share of the Chinese online market for goods and services sold from businesses to customers — enjoying 20.5 percent of the pie. Tmall, the largest such company in China measured by sales, had a 47.6 percent share, the report said.

In the business of arranging sales among customers in China, Taobao.com remained a dominant force, having a 94.5 percent share of that market during the same period.

Contact the writer at chenlimin@chinadaily.com.cn