However, following German invasion of Belgium in 1914, Xiong embarked on a journey to Paris, France where he enrolled at Lycée St Louis, focusing on mathematics.

During his tenure as professor of mathematics at the National Southeastern University, Xiong wrote more than ten textbooks on geometry, calculus, differential equations, mechanics, etc.

In the autumn of 1926, he received an invitation from Cao Yunxiang and Ye Qisun to join the mathematics department at Tsinghua University as a professor, teaching advanced courses in calculus, differential equations, and analytical functions.

[3] During this time, after reading Hua Luogeng's paper in the Shanghai Journal of Science, Xiong invited him to join Tsinghua University as an assistant in the library and meanwhile studying undergraduate courses.

The theses were examined by Émile Borel (President), Arnaud Denjoy and Georges Valiron and approved in June 1934.

Returning to Beijing in 1934, Xiong continued his role as a professor and head of the Department of Mathematics at Tsinghua University.

Under his leadership, the university underwent significant improvements, expanding to five schools with 18 departments, along with special training courses and laboratories by 1939.

[4] In March 1949, Xiong was instructed by the Department of Education to attend a UNESCO conference in Paris, after which he stayed in France to engage in mathematical research.

Around the same time, Hua Loo-Keng conveyed an invitation from Premier Zhou Enlai for Xiong to return to the People's Republic of China.

[3] Xiong was labeled a "reactionary academic authority" during the period of Cultural Revolution and was persecuted to death in 1969, at the age of 76.