No matter in the old days or in present modernized society, postal service always plays an important role in our life. In the past, it is the main bridge connecting with people. We all know that the communication field in the past is not well-developed. If people wants to communicate with someone does not live around them, sending letters is the most popular way. As the limitation at that time, sending letters is the most convenient way. Nowadays, although people have so many choices to connect others and send packages, postal service is very considerate relatively. For example, there so many logistics companies, but only postal service willing to go to the country. Without it, our life will be affected. It is clear that postal service is significant in our life.