Hau Chih-hsiung, who had served at an air base in the southern county of Pingtung, was charged last month with passing to China confidential information related to the E-2K, an improved version of the Grumman Hawkeye early warning aircraft.
Hau was convicted by the High Court in the southern city of Kaohsiung. It also passed a 15-year prison term on Wan Tsung-lin, the middleman in Hau's dealings with China.
Wan had run a karaoke club near the air base, the state Central News Agency said, adding that the pair had pocketed a total of USD 33,300 for their activities.
Military status. He has the right to appeal.
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Taiwan and China have spied on each other ever since they split in 1949 at the end of a civil war. Beijing still regards the self-ruled island as part of its territory awaiting reunification, by force if necessary.
Taiwan has been rocked by a spate of spying scandals in recent years, despite warming ties with China under Taiwanese President Ma Ying-jeou.
In September 2013 a retired vice admiral was jailed for 14 months for collecting confidential military information for China, just months after an former lieutenant general was indicted for leaking secrets to Beijing.