The economic growth figures were due to be published as the Communist Party's leadership gathered.
There was no reason given by the National Bureau of Statistics.
The decision is seen by some as a sign of further weakness in the world's second largest economy.
At this week's party congress in Beijing, the president is expected to be re-elected for a third term.
The publication of several key economic indicators, including third quarter GDP, had been delayed.
The figures have yet to be released.
A request for comment from the National Bureau of Statistics was not immediately responded to.
Pushan Dutt, an economics professor at INSEAD university, said the delay was a very rare event as the Chinese government had released data as scheduled.
He said that the numbers were not very good and that the goal of doubling the Chinese economy would not be achieved.
Dan Wang believes the delay may not be because of disappointing economic data.
She said that the normal procedure of signing off might have been disrupted by the swine flu.
The zero-covid strategy, which has weighed on China's economic growth, won't be loosened immediately, according to the president.
The size of an economy is measured by GDP. Gauging its expansion or contraction is one of the most important ways of measuring how well or badly an economy is performing.
China might miss its economic growth target.
The Politburo did not mention the official growth target in a statement after it met. Growth would be kept within a reasonable range.
China's third quarter GDP data is expected to not paint an optimistic picture according to ING Bank's chief economist.
She said that the data delay shows that the government thinks the 20th Party Congress is the most important thing happening in China.
The'miraculous' potatoes are said to alleviate poverty.
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