The view of contradiction is the essence and core of materialist dialectics. (2) Contradiction is the unity of opposites of things, which requires us to look at things comprehensively from a split point of view and oppose one-sided views. We should not only see the opposition between "pain and quickness" in urban life, but also see the unity of both sides of the contradiction; On the one hand, we can see that urban development makes life better, on the other hand, we can also see all kinds of troubles brought by urban growth. ③ Contradictory parties can transform each other under certain conditions, correctly analyze and create conditions to solve contradictions, thus promoting urban development. (4) Contradictions are universal, and it is required to admit contradictions, expose contradictions, analyze contradictions, and find the correct way to solve them. Only by acknowledging and daring to face the "pain" and "quickness" of the city can we solve the troubles of the city.