Tseng, playing the first LPGA tournament in her home country, was awarded player of the honors in pre-tournament ceremonies and then went out and shot a 72-hole total of 16-under-par 272 for the title.
It was her 12th LPGA title in her career and, counting events in the Taiwan and Australian tours, 10th overall this year.
Tseng posted a bogey-free 6-under 66 in the final round Sunday in her best round of the tournament. Amy Yang, who shot 67 Sunday, and Azahara Munoz (68) tied for second at 11-under 277. Morgan Pressel, who had the best score of the final round at 7-under 65, and Anna Nordqvist (71) tied for fourth at 9-under.
Tseng opened Sunday's play with a 2-stroke lead and pulled further ahead with a birdie at No. 2. She started to pulled away with three consecutive birdies over No. 6-8 and sealed the win with birdies at 16 and 18.