Summarizing the existing examples and striking phenomenons of the behaviors and action of youth, we can come to the conclusion that the most effective way to understand contemporary cultures is to analyze the trends of its youth. In modern society, to great degree, the decisions and preference of teenage are dominated by the contemporary main trends, at the same time, the inclination and liking of youth would provide a cogent access to guide the main stream culture. In another word, we can have a profound understanding about our culture through the analysis of the trends of youth.For one thing, the educated young people are the dominant categories of those popular and favorable objects. Meanwhile, the youths with good education play a great influence on the element of young people. We can find that the young people guide the direction of society and their thinking and action is the reflection of culture trends. For example, as a young men, I can deeply feel that the position of youth in the society is very imperative. When a new idea and a original product are produced, it is the young people that accept it with great speed. That is the youths who enter the new things. Take the education as an example, nowadays, more and more young people would like to go broad for studying konwledge. We can get the facts and statistics from the authority that the number of young men and women who are the centeral of their families could persuade their parents and kins to accept the new ideas and new popular trends. The effects brought by the youngsts little by little dominate the society. The culture of the society is greatly influenced by their behaviors and actions.For another aspect, we can take the comsumerism in the cloth, marketplace, and electronic malls etc., the young people still exert much influence on the trends. as we all know, the consumerism is the indicators of our comtemporary culture. Let us consider one specific situation, if the marketplaces or malls and so on were not accepted by youth, what was the result? The result is manifest that the marketplaces and others would go down, and sometimes, they could be bankrupted. Let's take the apple company as an case, the apple company take the advantages of the youth's likings and preference, their products are the best favorable objects acceped by youth. This is the reason that the apple company will prosper in short tens years and dominate the heart of the people. So, we can draw the conclusion that the trends of youth play an important role in the comtemporary culture.