At BBCU, Chainarong was the 2010 Thai Division 1 League top scorer with 19 goals.

In the second leg of the 2013 Thai Premier League, Chainarong came back to Muangthong after impressive form with Army United.

In recent seasons, he has again gone out on loan from Muangthong, spending 2015 with Osotspa Samut Prakan.

Chainarong was called up to the national team for the 2015 AFC Asian Cup qualification against Kuwait and Iran, but didn't get a chance to play.

Chainarong was also part of Thailand's squad in the 2014 AFF Suzuki Cup.