Official data showed that China received USD 126.27 billion last year registering a 6.4 per cent increase.
Foreign Direct Investment (FDI) in December reached 77.02 billion yuan (USD 12.2), Ministry of Commerce spokesperson Shen Danyang told a press conference.
He attributed the decline to a higher base in the same month of 2014 as well as changing currency trends and market conditions, without elaborating.
The Chinese currency, yuan, has been weakening since China's central bank revamped the foreign exchange mechanism in August 2015, saying it was making the rate more market- based.
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Despite the FDI decline in December, Shen said the total FDI for the whole year of 2015 rose 6.4 per cent from 2014 to USD 126.27 billion.
China's FDI growth saw ups and downs in the first 11 months of 2015.
It accelerated to 22 per cent in August before winding down to 1.9 per cent in November.
In December, more than 2,000 foreign-funded enterprises were newly established in the mainland, up 17.9 per cent year on year, Shen said.
Direct investment in 49 countries along the Belt and Road route rose 18.2 per cent in 2015, accounting for 12.6 per cent of the total.
ODI rose 6.1 per cent year on year in December, slowing from a 12.6 per cent increase in November, he said.
China brought in 86.5 billion yuan (USD 13.89 billion) of ODI in December, Shen said.
Despite the global economic downturn, Chinese companies remained active in overseas mergers and acquisitions (M&A) last year, which have become a key mode of overseas investment, he added.
He cited the purchase of a nearly 60-per cent stake in Italian tire maker Pirelli by China National Tire & Rubber Co. Ltd. As the biggest outbound acquisition by a Chinese firm in 2015.
Last year, China signed USD 210 billion of contracted projects overseas, up 9.5 per cent year on year, with 44 per cent of the deals inked with 60 countries along the Belt and Road route, Shen said.