To establish a comprehensive credit system will be in line with the decision of the recent Third Plenary Session of the 18th Central Committee of the Communist Party of China, which highlighted the role of an inclusive financial sector, especially in serving cash-strapped small and private companies.

Zou Pingzuo, a researcher with the central bank's research bureau, said China's financial system is in an inverse-pyramid shape, meaning that most of the money is flowing into the banking system, and much of the capital has been injected into State-owned enterprises.

Although China's financial assets total 150 trillion yuan ($24.6 trillion) and the broad money supply has also exceeded 108 trillion yuan, the discrimination against non-State companies makes it hard for the money supply to touch the real economy on the bottom.

"As for now, the financing costs for private companies are still as high as 20 percent a year," he said.

Ma said: "Banks wouldn't intentionally differentiate between private companies and SOEs, but SOEs do have more guarantees and lower risks."

He said only a comprehensive credit system that includes all relative information of a private company could eliminate such "discrimination".

The establishment of such a system will also come along with bolder steps taken by financial institutions in the tested area.

By Monday, there were 17 banks among those that have won approval to register a branch within the FTZ.