It seems that wearing school uniform is indispensable to students in Hong Kong. Secondary school, primary school and even kindergarten students have to wear school uniforms. We put on our school uniforms every day without wondering why we have to wear them. It is actually something more than a school rule. In the western countries and America, most students do not have to wear school uniforms to school. Why is there such a phenomenon? We have to wear school uniform while the westerners and Americans are exempted form the rule. In fact, there are merits as well as demerits in wearing school uniform. In this essay, I will try to analyze the pros and cons of the issue.