Thongchai begun to work since 1975 after he had been appointed to be the promoter at Lumphinee muay thai stadium in Thailand because he have many muay thai training camps . Besides, on last 4th January 1997 , he had been appointed to be the committee of the new standard by build up the new muay thai stadium at Chachoengsao province named “International muay thai stadium of Thailand”. Moreover, for this building , there was the commander Chattha Thanacharo and the principal of amateur international boxing club of Thailand to be the president for opening this ceremony too. Unfortunately, on last 19th December in 2000 , Thongchai had quitted from being the promoter of Lumphinee muay thai stadium and set up the last program of Lumphinee muay thai stadium for the last time. Then, on the same year of 31st December , the programs of this new muay thai stadium or theinternational muay thai stadiumof Thailand had moved to setup at the temporary muay thai stadium at Convention hall in the mall ngamwongwan also. Next, until last 7th Januaryin 2001 , there was the beginning of the competition at the temporary muay thai stadium in Convention hall of the mall ngamwongwan and the mall thapra. Later, on the same year of last 25th January , Thongchai was appointed to be the 13rd promoter of Rachadamnern muay thai stadium to setup Suek OneThongChai until now.
Quitted from Lumphinee to be the promoter of Rachadamnern.
However, although he was successful in the route of setup boxing program , but he is the extremely self-confident one until sometimes it brought the conflicts to several people. Then, on last 19th December in 2000 , Big Song hadsetup Suek OneThongChai for the last match at Lumphinee muay thai stadium prior to quit from the promoter of Lumphinee muay thai stadium and on the same year after 31st December, he had moved the competition of the international muay thai stadium to setup at the temporary muay thai stadium at convention hall in the mall ngamwongwarn and on last 25th January in 2001 , he was appointed to be the 13rd promoter of Rachadamnern muay thai stadium.
Big Song make the conflicts until being removed from his position.
Then, after setup Suek OneThongChai on the first match at Rachadamnern muay thai stadium, Big Song still create new dimension , hope and excitement back to Rachadamnern muay thai stadium and bring many muay thai training camps with him . However, he still has the problem about the different opinions to the committee of muay thai stadium continuously until now prior to make up the conflicts and quarreled with the committee of muay thai stadium. Finally, he was cut all the quotas of Rachadamnern muay thai stadium after the agreement in the meeting of promoters in Rachadamnern muay thai stadium since 13rd June in 2013.