My name is Sam. I was born in HuNan province,China. Both my father and mother is doctor in charge. I have a sister, and we enjoy a very harmonious family life. My parents gave me a strict guidance which helped me develop an independent and hard working character. I received a very good home education both in moral and intellectual in my childhood. During the six years in the middle school, I was particularly interested in and pretty good at science subjects. Since my young days, I have always been trying to cultivate a good character, paying attention to polite manners and noble ideas. I often examine myself whether I am honest and faithful to friends, respectful and obedient to teacher, loyal and devoted to duties. I put strict demands on my speech and behaviour in my daily activities. In addition, I am physically strong because I always keep on doing exercises. It is true that health is the guarantee for one’s success in career. I have, of course, weakness and shortcomings. Especially, I am impatience with difficulties and hesitation in making some decisions. I consider them my bitter enemies, which I must make effort to overcome.