He is known for his roles in television series Story of Yanxi Palace, The Legends, Arsenal Military Academy: AMA, Falling Into Your Smile, Royal Feast, She and Her Perfect Husband,[1] and Best Choice Ever.

In 2016, he entered the entertainment industry after signing a contract with Huanyu Film, a company owned by Yu Zheng[8] He was cast in the series Zhaoge, where he played "Yang Jian".

[24][25][26] His portrayal of rich playboy earned him the "Best Actor Award" at the "Hengdian Film" and at "TV Festival of China and Singapore’s "StarHub Night of Stars".

[32] In 2021, Kai starred in the Chinese e-sports romance comedy series Falling Into Your Smile as "Lu Sicheng", which was popular in the international market.

[36] In 2022, Kai played lead role of "Zhu Zhanji" in the historical fiction drama Royal Feast, which gained more than 400M in the viewership.

[42][43] From 2018 onwards, Xu Kai has collaborated with various luxurious international brands such as Givenchy, Adidas, Versace, Tom Ford, Tiffany & Co., Roger Dubuis, Disney, Ralph Lauren, Bvlgari and Brunello Cucinelli.

[54] He also appears in the brand's campaign for Qixi, one of China's local iterations of Valentine's Day, which falls in August.

[60] On April 26, 2023, Xu Kai as Brand Ambassador for Bvlgari attended Avrora Awards Ceremony in Beijing, China.

[61] Xu Kai was listed in Forbes China "Top Influential People under 30 years old", for his substantial impact in the entertainment fields.