During his military career, Hau cultivated a broad understanding of international politics, foreign affairs, science and technology, and social and mainland affairs, but observed a strict separation between the military and politics.
他任軍職時，即對國際政治、外交、科技、社會及大陸問題等，有廣泛而深入的瞭解，但嚴守軍政分際，謝絕政治性的酬酢往來。