Lin defeated compatriot Tian Houwei 21-19, 21-8 in Wuhan for his fourth Asian title.
In women's singles, seventh seed Ratchanok Intanon of Thailand beat top seed Li Xuerui of China 20-22, 23-21, 21-12.
In the men's doubles, Lee Yong-Dae and Yoo Yeon-Seong of South Korea beat Indonesia's Mohammad Ahsan and Hendra Setiawan 18-21, 24-22, 21-19.
In the women's doubles final Chinese duo, Ma Jin and Tang Yuanting beat compatriots Wang Xiaoli and Yu Yang 21-12, 21-12.
And in mixed doubles final Indonesian pair Tontowi Ahmad and Liliyana Natsir beat Lee Chun Hei and Chau Hoi Wah of Hong Kong 21-16, 21-15.