The futures market is expanding in the country with more transactions and trades, according to data released by the China Futures Association (CFA) on Tuesday.

The combined turnover in China's four futures exchanges reached 24.5 trillion yuan (about four trillion U.S. dollars) in September, up 17.7 percent from the same period last year, said the CFA.

The turnover in September was 14.8 percent higher than that in August, according to the CFA data.

China Financial Futures Exchange is the biggest marketplace by turnover, followed by Shanghai Futures Exchange, Dalian Commodity Exchange and Zhengzhou Commodity Exchange.