China could adopt a strategy that promotes easier and less risky reforms at first, namely deregulating direct investments in three years, and then move on to higher-stakes items like real estate and bond trading in five to ten years, according to the PBOC study authored by the central bank's financial survey and statistics chief Sheng Songcheng.

Analysts assume the Chinese central bank will expand the yuan's trading band against the dollar to 2 percent by the end of 2013.

"It's not a good time to widen the band. The money inflow is so severe at the moment," said Chang Jian, China economist with Barclays Capital. She suggested the authorities could instead allow individual investors to seek opportunities aboard.

Economists said to facilitate the liberalization of the capital account, China must ratchet up its financial reform, which means higher efficiency, stronger competition, a bigger bond market and lower risks involved with local governments' debt.

"The first step is to liberalize China's interest rates. The sooner the better," Chang said.

The Chinese central bank set benchmark interest rates for the market and only allows them to float within the floor of lending rates and the ceiling of deposit rates. Last year, the central bank expanded the range twice. Further relaxation is expected in the second half of the year.

Chang added cultivating the bond market will improve the country's financial efficiency as well.