Leftist or Maoist influence is still threatening reforms and vested interest groups have become obstacles to progress, legal scholar Dr Liu Defu said yesterday.
Dr Liu strongly criticised remnant Maoists for 'blackening' reforms whenever they had the chance.
In China, there were a few people who opposed reforms, he said.
These leftists were stubborn and resorted to their old positions whenever 'the wind changed', said Dr Liu, a research director under the General Office of the Communist Party's Central Committee.
'There are people who always want to use old methods and retreat when reforms encounter setbacks,' he said. 'They blame the problems on reforms.' He said many so-called reformers had withdrawn their support for new policies once they felt that their own interests would be threatened if further reforms were carried out.
He warned that reforms had reached the point of no return and called for more substantial changes to the present system and power structure.
'The reform process is a process of smashing through all these trappings of leftism,' he said.
Dr Liu's criticism is the latest in a series of pro-reform offensives that have been launched by liberal scholars and economists in the run-up to the 15th Party Congress, which is being held in Beijing next month.
Despite the liberal support, political reforms are not expected to be high on the Congress agenda.