Abstract: In the end of the Ming Dynasty,the calendar bureau was opened and organized to translate "the Chong Zhen Calendar almanac" and introduce the western astronomy instrument,and this caused China's astronomy to step onto the communal development path with the world astronomy.The western missionary also took the opportunity of entering the calendar bureau to participate in repairing the calendar,and they could go down to the palace to do missionary work,and caused Catholicism's dissemination enterprise in China ...