Its low placing is unlikely to change anytime soon, Liao said.
"In China now, most of the corrupt officials would compete to see whoever received more bribes."
The traditional giving of cash-filled red envelopes during festivals and special occasions has expanded to encompass paying officials for favors, a practice denounced recently by mainland Chinese state media.
Nor will China's recent well publicized conviction of former high-flying politician Bo Xilai on corruption charges change day-to-day realities, said Liao, because stamping out corruption is not simply a legal issue.
"Even today, many of the country's top leaders think fighting corruption means putting people in jail," Liao said.
"People in Hong Kong would take it as shameful to receive bribes," said Liao. China needs "a society-wide change in values," he added.