Felipe Aguilar had the clubhouse lead after the players were called off for lightning at the Volvo China Open on Friday.
The Chilean backed up his opening round of 68 with a seven-under 65 at the Topwin Golf and Country Club, enough to put him on 11-under for the event, one-stroke ahead of Alex Noren and Bernd Wiesberger.
Aguilar's flawless round included seven birdies, five of the coming on the back nine.
"I played quite solid today, I don't think I missed one green," the two-time European Tour winner said after the round.
I played quite consistently throughout my first two rounds so I'm quite happy. It's been a tough start to the year so hopefully this will be a turnaround for me.
"I struggled with a couple of bad shots but I ended up being in the right spots on the right greens."
A whole host of players are locked on nine-under, including overnight leader Hennie Otto, who still has four holes to play.
The Englishman carded a 66 to put behind him the disappointment of playing alone and missing the cut last week.
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