How to evaluate the two-process theory and the three-step theory? This has profound practical significance for the development of historical research. First, the main ideas of the basic clues of China's modern history. Two processes, three revolutionary climaxes, two trends, three steps, two tasks and innovation. This has profound practical significance for the development of historical research. The main points of the basic clues of China's modern history. Two processes, three revolutionary climaxes, two trends, three steps and two tasks.