China's December PPI down 3.3%

"That means the effect of the rate cuts is weak, and the central bank must cut the reserve ratio more than once to ensure that the monetary policy is effective," Liu said.

He forecast three RRR cuts of 50 basis points each in 2015.

Strong headwinds from the property market correction, overcapacity in upstream industries and high local government debt are the main causes of the slowdown.

"Increasing deflationary pressure in China will push up real interest rates and compel more rate cuts," said Wang Tao, chief economist in China at UBS AG.

"We expect at least two more cuts in benchmark lending rates totaling 50 basis points by end-2015, and we see the central bank continuing to provide sufficient liquidity to keep the money market rates low.

"Rate cuts are key in driving down debt service burdens, improving corporate cash flow and reducing financial risk by slowing the pace of nonperforming loan formation. We do not see these measures as having a significant stimulative impact on credit and GDP growth," she said.