Abstract:The paper initially explores the internal structure of the closed Baochu Pagoda after its reconstruction in 1933, based on the correlation and integration research of Baochu Pagoda construction project from 1929 to 1938 and radar detection. This paper reviews the plan, fundraising process and construction of Baochu Pagoda reconstruction in the Republic of China period through literature research, and verifies the possible internal structure of the first to fifth floors, the sixth to seventh floors and the top floors of the Pagoda after the construction project through the analysis of radar detection images, which provides a useful academic research basis for the protection and management of the West Lake cultural heritage.