Jaidee's 54-hole total, 9-under 207, leads Sweden's Alexander Noren (66) heading into Sunday's fourth and final round at Bali's New Kurta golf resort.
Jaidee opened his third round with five birdies on the front nine. Later, he closed with a 14-foot birdie at No. 18, which secured his spot at the top of the leader board.
"If you make the fairway, it's easy to get on the green," said Jaidee, who seeks his third win on the European Tour. "But the greens are also very tricky this week. On the 18th, I read the line well. It was a nice finish and I enjoyed it."
England's Ross McGowan (69), Simon Dyson (70), Richard Bland (66) and Simon Griffiths (69) and Denmark's Jeppe Huldahl (70) all are 7-under 209 to share second place.