The 24-year-old South Korean shot a 5-under 67 on Saturday to reach 12 under at Mission Hills, putting her in position for her second major title and second victory of the year. She won the 2008 U.S. Women's Open and added her fourth LPGA Tour title in February in Thailand.
Lizette Salas, a stroke behind Park entering the round, had a 69 to remain second.
Hall of Famer Karrie Webb, the tournament winner in 2000 and 2006, was five strokes back at 6 under along with Suzann Pettersen, Angela Stanford, Jessica Korda, Karine Icher and Pornanong Phatlum. Stanford had a 66, the best round of the tournament.
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