Dr Arthit excelled in a variety of government roles early in his career, gaining the solid understanding of Thai government needed for his future political career. Leading the Bangkok Metropolitan Water Authority, both expanding it and enabling it to become profitable was one of his early success stories. 

Like many aspiring politicians his election campaigns were well recognised, but ultimately were initially unsuccessful. He persevered and was elected to the House of Representatives in 1988. 

As a politician he has fulfilled numerous high level roles including Minister of Foreign Affairs, and Education Minister, but most notably he was Speaker of the House of Representatives during the 1992 political turmoil. As such he was responsible for nominating Anand Panyarachun to be Prime Minister and lead Thailand towards reform.