The fresh losses, in a volatile session, came despite an unprecedented effort by the government of the world's second largest economy to shore up prices following a month-long rout.
The recent turmoil followed a stock boom encouraged by the authorities, and their willingness to intervene in the market has raised questions over their commitment to economic reforms.
The Shanghai Composite Index fell 1.68 per cent, or 62.56 points, to 3,663.00 on turnover of 685.1 billion yuan ($112.0 billion) after falling as much as 5.0 per cent and rising up to 0.93 per cent during the day.
Some of China's legions of small investors -- who dominate the market, unlike most exchanges worldwide, where institutions are the largest stockholders -- say they are heading for the exits.
"I sold 90 per cent of my stocks since I saw several reports saying that the market is due for a correction," said Ling Lihui, a manager at a market research company, who sold last week.
Monday's 8.48 per cent fall in Shanghai was the biggest drop since February 27, 2007 and sent tremors through global bourses.
On Wall Street the Dow fell 0.73 percent on Monday while London, Paris and Frankfurt also lost ground on China worries.
Asian markets mostly fell again Tuesday but Hong Kong, which is closely linked to the mainland, was 0.71 percent higher in late trade.
After Monday's collapse, the China Securities Regulatory Commission (CSRC) said it would continue to "stabilise" prices.
The state-backed China Securities Finance Corp., tasked with supporting the market, would increase its share holdings, the CSRC said in a statement.
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