At the beginning of the 15th and 16th century, the West and the East both did extensive navigation activities, but the results were far from each other. Having cost a huge amount of money without any effects, Chinese navigation activity was buried as a "failure policy". The finding of the "new land" by westerners bad promoted the development of the world trade, and provided the first hand scientific research information. Why were there so many differences in the same activity? Unlike westerners, Chinese people did not have the concept that "the earth is round", and the theme to conquer different races. Its purpose for research on nature appearance was only used on practice.