* Hang Seng index ends up 0.1 pct
* China Enterprises index HSCE falls 0.5 percent
* HSI financial sector sub-index flat
* HSI property sector sub-index index down 0.3 pct
March 20 (Reuters) - Hong Kong stocks were little changed on Tuesday, as investors braced for Federal Reserve Chairman Jerome Powell's first policy meeting starting later in the day and amid concerns that U.S. President Donald Trump could impose additional punitive trade measures against China.
** The Hang Seng index rose 0.1 percent to 31,549.93, while the China Enterprises Index lost 0.5 percent to 12,597.42 points.
**The sub-index of the Hang Seng tracking energy shares rose 0.6 percent while the IT sector rose 1.05 percent, the financial sector was 0.28 percent lower and property sector dipped 0.26 percent.
** The top gainer on Hang Seng was Sunny Optical Technology Group Co Ltd, up 8.7 percent, while the biggest loser was New World Development Co Ltd, which was down 1.54 percent.
** China's main Shanghai Composite index closed up 0.3 percent at 3,290.64, while the blue-chip CSI300 index was up 0.08 percent at 4,077.70.
** Around the region, MSCI's Asia ex-Japan stock index was firmer by 0.11 percent while Japan's Nikkei index closed down 0.47 percent.
** The yuan was quoted at 6.3321 per U.S. dollar at 08:14 GMT, 0.02 percent weaker than the previous close of 6.3308.
** As of the previous trading session, the Hang Seng index was up 5.33 percent this year, while China's H-share index was up 8.1 percent. As of the previous close, the Hang Seng has risen 2.17 percent this month.
** The top gainers among H-shares were CSPC Pharmaceutical Group Ltd up 11.39 percent, followed by China Gas Holdings Ltd gaining 8.89 percent and Shenzhou International Group Holdings Ltd up by 1.68 percent.
** The three biggest H-shares percentage decliners were China Pacific Insurance Group Co Ltd, which was down 2.57 percent, China Vanke Co Ltd, which fell 2.2 percent, and New China Life Insurance Co Ltd, down by 2.2 percent.
** About 1.80 billion Hang Seng index shares were traded, roughly 75.4 percent of the market's 30-day moving average of 2.39 billion shares a day. The volume traded in the previous trading session was 1.49 billion.
** At close, China's A-shares were trading at a premium of 26.18 percent over the Hong Kong-listed H-shares.
** The price-to-earnings ratio of the Hang Seng index was 13.49 as of the last full trading day while the dividend yield was 2.7 percent. (Reporting by the Shanghai Newsroom; Editing by Sunil Nair)