Jutanugarn, a member of the Ladies European Tour after leading the qualifiers at the recent Tour School, led into the final round by three over Se Ri Pak, Beatriz Recari and Stacy Lewis and by four over Park.
She appeared to be totally in control when she aced the 12th and birdied the 13th to move to 15 under par at which point she had a three shot lead over Park.
Even a bogey at the 14th still had her two ahead although the disaster at the par five 18th handed the title to Park.
Park birdied six of her first 11 holes but a bogey at the 14th appeared as if it might cost her any chance of winning the title.
Under the intense scrutiny of all of Thai golf, Jutanugarn would self implode at the final hole, eventually missing a four foot putt which would have at least given her a chance in a playoff.
For Jutanugarn it would be her second runner-up finish in her last three starts having also finished tied for second behind Karrie Webb at the Volvik Ladies Masters on the Gold Coast.
The current world number four, Park continues her geat run of consistency having been either first or second in eleven of her last fifteen starts worldwide.
Just as she had done last week in Canberra, world number one, Yani Tseng, came from the clouds, this time with a final round of 63, to get within two of victory. She shared third position with Recari, Lewis and So Yeon Ryu.
New Zealander Lydia Ko finished as the best of the Australasians when she finished 14th while Karrie Webb was 28th.
The LPGA Tour now moves to Singapore for the HSBC Women's Champions event.