The number of online shoppers in China jumped 48.6% in 2010 from a year earlier, making e-commerce the fastest growing internet segment, while the number of e-bank and online payment users increased by 48.2% and 45.8% respectively over the same period, according to a report by China Internet Network Information Center.

According to the 27th China Internet Development Statistics Report, there were 457M internet users in China at the end of 2010, up 16% year-on-year, while internet penetration rose 5.4% from a year earlier to 34.3%. By contrast, internet penetration in the U.S. is around 70%.

Almost 100% of large companies and 92.7% of small and medium-sized enterprises were connected to the internet by the end of last year, according to the report. The report said 43% of Chinese companies had their own websites or online stores, and 57.2% of companies were communicating or providing consulting services to their clients through the internet at the end of last year.

Online marketing and e-commerce is playing an increasingly important role in SMEs’ marketing strategies. According to the report, the online marketing and e-commerce application level for small and medium size enterprises is 42.1% in 2010, and 21.3% of them are using e-mail for online marketing.

However, network security is still a big problem in China. According to the report, 45.8% of netizens were attacked by viruses and Trojans in 2010, while 21.8% of netizens had their accounts or passwords stolen.