SHANGHAI, Sept 15 (Reuters) - China's key stock index ended up 0.2 percent on Tuesday supported by improved August FDI data while tyre makers jumped after saying the impact of the U.S. decision to impose special duties on Chinese tyre exports would be limited.

The Shanghai Composite Index .SSEC ended at 3,033.728 points, a new one-month closing high, after fluctuating around key resistance at 3,000 points and rising 1.24 percent on Monday.

Gaining Shanghai A shares outnumbered losers by 598 to 310, while turnover edged up to 160 billion yuan ($23.4 billion) from 157 billion yuan on Monday.

China's upbeat August economic date could continue to buoy the uptrend in the index.

China drew $55.86 billion in foreign direct investment (FDI) in the first eight months of the year, 17.5 percent less than in the same period in 2008, but that was an improvement compared with a 20.3 percent fall in the first seven months, the Commerce Ministry said on Tuesday. [ID:nBJB000666] ($1 = 6.83 yuan)