He won seven time, losing only once against fellow-countryman Thanomsak Sithbaobay, and capturing WBC Super flyweight International Champion by wins over Dadoy Andujar, a Filipino boxer.
On December 22, 1991, Pongsupa challenge WBC Super flyweight World Champion against Moon Sung-kil, a Korean holder at Indoor Gymnasium, Incheon, South Korea.
He told the background the bout in South Korea, he was taken advantage of, for example, the organizer puts him in a wide gym with only one heater in the cold with Ricardo López, who fights on the undercard, or when Sung-kil weighed himself and found that probably over 115 pounds, but the supervisor allowed it to pass, etc.
He worked at Osotspa Company as a public relations officer for many years, and then he came back to boxing with Orathai Kanchanachoosak as a manager and promoter.
On 11 May 1996 he challenge the minor institution WBF Junior featherweight with Tony Wehbee, an Australian owner at Ratchawong Pier, Yaowarat, Bangkok, he was the winner by majority points decision.