The 25-year-old Thai player won the Shenzhen International on Sunday after beating Li Hao-tong in a play-off.
After carding a first round 71 at Tomson Shanghai Pudong Golf Club on Thursday, he notched a four-under-par 68 to take the clubhouse lead, although his score of five-under has since been surpassed.
"I'm very happy, especially as it's playing tough – there are lots of slopes on the greens and the course is very firm," Aphibarnrat told the European Tour from the clubhouse in Shanghai.
"I'm not driving the ball as well as I did last week, but the rest of my game is in pretty good shape, especially my short game.
"I'm still feeling good; I've been getting lots of rest and eating well, so I'm feeling fine and ready to go.
"Mentally I'm still sharp and my confidence is high, so I just have to keep it up.
"My Mum is still here with me and she told me to keep going and win back to back, so hopefully I can do it for her. She's my good luck charm."
Starting his round on the back nine, he notched three birdies on his first five holes to close the gap to first round leaders Bradley Dredge, Michael Hendry and David Howell.
A birdie at the first put him on five-under for the first time this week and although he dropped a shot at the third, an eight-foot putt for birdie on the final hole saw him gain the shot again.