A former Chinese banker has been sentenced to three years in prison for forging and trading official documents, a court in northwest China's Shaanxi Province announced on Sunday.

Gong Aiai, mocked by Chinese netizens as "Sister House", was found with a huge number of properties purchased under fake IDs, and was convicted at the People's Court of Jingbian County.

Gong, former deputy head of the Shenmu County Rural Commercial Bank in Yulin City, was found to have illegally purchased Beijing hukou (household registration) for her daughter and herself at a cost of 300,000 yuan (48,000 US dollars) in 2005, in order to buy houses in the capital.

The 49-year-old was also charged with forging two ID cards with the names Gong Xianxia and Gong Aiai.

The court ruled that Gong had violated the household registration system and disturbed social order.

In January, online whistleblowers revealed that Gong had more than 20 properties in Beijing worth an estimated 1 billion yuan under the names Gong Aiai and Gong Xianxia.

A police investigation found that Gong had four hukou IDs and possessed 44 Beijing properties with total floor space of 10,543 square meters. The total property value was estimated at about 395 million yuan.

While Internet users questioned whether the money Gong used to buy property was earned legally, police said they have not received reports that Gong was involved in illegal fundraising, absorption of public deposits, or contract fraud.

Gong previously said in court that she earned money mainly through the coal business and had borrowed money from friends. She claimed that all her possessions were gained through legal means.

Gong's case has aroused a wave of public outcry for stricter management and supervision of the country's hukou mechanism as well as the use of ID cards, which were first introduced in 1984.