Einstein 1900 graduated from Swiss Federal Institute of Technology in Zurich and became unemployed after graduation. With the help of my friends, I got a job in the Swiss Federal Patent Office. 1905 received a doctorate from the University of Zurich. 1909, he was an associate professor of theoretical physics at the University of Zurich and a professor at the University of Prague in 19 1 1. Two years later, he became the director of the Royal German Institute of Physics and a professor at the University of Berlin, and was elected as an academician of the Prussian Academy of Sciences. 1932 was persecuted by Hitler and left Germany. 1933 10 settled in the United States. Einstein has made contributions in many fields of physics, such as studying capillary phenomenon, expounding Brownian motion, establishing special relativity and extending it to general relativity, putting forward the quantum concept of light, fully explaining photoelectric effect, radiation process and specific heat of solids with quantum theory, and developing quantum statistics. And won the Nobel Prize in Physics at 192 1.