He was the founder and president of the Goldlion Group Co. Ltd. and a member of the Standing Committee of the National People's Congress (NPCSC).
[citation needed] Together with his wife Huang Liqun, Tsang founded his manufacturing company which later became Goldlion Group Co. Ltd. when he cleared half of his house for a workplace.
He was a member of the Selection Committee, which was responsible for electing the first Chief Executive and Provisional Legislative Council He was a vocal supporter of the Beijing government and strong critic of the pro-democracy camp.
In 2004, he accused Martin Lee, Szeto Wah and Cheung Man-kwong are "definitely unpatriotic" for their bag of sins (being key members of the Hong Kong Alliance in Support of Patriotic Democratic Movements in China formed during the Tiananmen protests of 1989), including objecting to the Hong Kong Basic Law Article 23 national security legislation and organising the 1 July 2003 rally.
He was also among the first recipients of the Grand Bauhinia Medal in 1997, the highest honor of the Hong Kong Special Administrative Region.
Tsang was named an honorary citizen by several major Chinese cities, including Beijing, Harbin, Shenyang, Dalian, and Guangzhou.