China has created a new law to impose heavy fines on internet shopping websites which publish false advertisements about their products.
Vendors who delete negative online reviews or post fake positive reviews face a minimum $30,000 fine.
"Proper online market competition is one of the highlights of the revision," said Yang Hongcan, director of the division of anti-monopoly and anti-unfair competition law enforcement with the State Administration for Industry and Commerce.
The law states that e-commerce operators should neither deceive nor mislead consumers by faking sales volume or user comments.
"Operators shall not fabricate transactions to help others in commercial promotions," the revision says.
The new law aims to clean up China's internet shopping websites just before Singles Day - the country's busiest online shopping day of the year.
Last year's Singles Day saw sales worth almost $18 billion in 24 hours.
Chinese consumers placed 657 million orders.
Most Singles Day vendors sell through the online platform Alibaba, which has been heavily criticised for failing to police the claims some sellers post about their products.
The authorities are also trying to stop the use of a technique known as brushing - when vendors stage fictitious sales in order to boost their standing in website search results.
China in August launched a digital "cyber-court" to help deal with a rise in the number of internet-related claims, including online shopping disputes.
Singles Day is held every year on November 11. The day is also referred to as Double Eleven because of its date.
Originally claimed as a celebration for China's young singletons, Alibaba turned it into a shopping bonanza in 2009.
In August Alibaba reported strong earnings, posting a 56% rise in quarterly revenue.
Analysts say that Asia in general and China in particular are at the centre of the global shift towards e-commerce.
The draft lays out that customers can refund products purchased online within seven days. The customer can return products without giving reason and they must be responsible for the return shipping fee.
Showrooming is something I've done. I go into a shop to browse. I can see, touch and try out products but then go home and buy them online at a knock-down price.
Serial returner refers to someone who regularly orders more than they need and sends some of the items back.
Weibo user @Yanjinggong said:"I was complaining that Double 11 was only a trap for consumers, but now I am a girl eating dirt."
Sofa Sunday is the Sunday after the United States Thanksgiving holiday, when people relax at home and purchase goods online or on TV.