"Our investment in the company reflects our shared belief in their vision to make the flying car a reality," said Li Shufu, Geely's founder and chairman.
The firm refused to confirm financial details of the acquisition but said it had tripled the number of engineering staff in anticipation of the takeover.
"The support that Geely has pledged to make Terrafugia's vision a commercial reality is unprecedented," said Terrafugia's newly appointed CEO Chris Jaran, who was most recently managing director of Bell Helicopter.
The Hangzhou-based Geely, which already owns Volvo and Lotus, is the latest firm to join a growing number of companies investing in making flying cars a reality.
Boeing recently bought Aurora Flight Sciences, a specialist in unmanned planes. Google's Larry Page has invested up to US$100 million ($145m) in two flying car start-ups, while Uber is developing flying car services in Dubai that it hopes to launch in 2020.
Although it's still likely to be several years before these types of vehicles become commonplace on our roads and in our skies, industry insiders say good progress is being made towards that goal.
"Although it will take some years for makers of flying cars to achieve commercial success, it makes good sense for Geely to first go in and acquire the know-how as part of its long-term agenda," said Yale Zhang, managing director of consultancy Automotive Foresight.
The Terrafugia deal has received approval from all relevant regulators including the Committee on Foreign Investment in the United States.
This article was first published in the South China Morning Post