His most notable win came at the 15-17 age group event at the Junior World Golf Championships in San Diego, California.

Chinnarat won his second event on the Asian Tour at the 2006 Crowne Plaza Open.

He almost picked up his third Asian Tour victory at the 2007 Midea China Classic but fell to Thaworn Wiratchant in a playoff.

He earned his European Tour card for 2009 by finished T12 at qualifying school.

Chinnarat won his third event on the Asian Tour at the 2009 Queen's Cup.