BEIJING, Dec. 22-- The Chinese mainland super-rich are closing the wealth-accumulation gap with overseas Chinese millionaires, according to a report released Monday.

The report compared mainland super-rich and their overseas counterparts in regions of Southeast Asia, Europe, Taiwan and Hong Kong.

From 2008 to 2013, the incomes of the top 180 richest people on the mainland expanded four times faster than that of the top 180 richest overseas Chinese expatriates, said the report, which also referred to research by the Hurun Report and Forbes lists.

It also found that the mainland rich mainly made money in the real estate, high-tech and heavy chemical industries while overseas Chinese millionaires made their fortunes in real estate, manufacturing and financial services.

The report was first published by Huaqiao University in 2010, this is the fourth time the study has been undertaken.