Chinese-American physicist Li Zhengdao said that "China's abacus is the oldest computer in the world. " British scholar Needham also called the abacus "the fifth-largest invention in China. " Then, why is the abacus so attractive that it won two people? What is the high respect for scholars? It is the simple structure of the frame beam and beads, combined with the exquisite abacus formula, to solve the calculation problems of addition, subtraction, multiplication, division, and even the square. In the era of no computer, it has promoted social economy Development has played an inestimable role. This text mainly introduces:. ['Structure and principle of abacus.', "Reasons for the abacus' respect.", 'The role of abacus on the social economy.', 'The status of the abacus in the history of science and technology.']