The head of China's National Bureau of Statistics (NBS) is being investigated for "severe disciplinary violations," according to the Communist Party of China's top anti-graft body.

Wang Bao'an, 52, was appointed in April 2015 after serving as vice minister of finance for three years, according to his resume on the NBS' website.

Wang was seen at an NBS press conference on Tuesday afternoon shortly before the announcement of his investigation was made, the Central China Television reported.

Wang expressed his confidence toward China's economy at the press briefing, saying the yuan's depreciation in recent months would not have a significant impact on the Chinese economy.

He also brushed off billionaire investor George Soros' earlier comments about a hard landing for China, adding that the opinion was inconsistent with the economic reality in China, Hong Kong-based Ta Kung Pao reported.

Wang had worked for the State Administration of Taxation from 1994 to 1997, and at Ministry of Finance from 1998 to 2015.

As an agency under the State Council, the NBS is in charge of monitoring and releasing the country's economic performance. The agency is also responsible for organizing and coordinating statistical and national economic accounting work, the NBS website said.