Abstract: Deformation of buildings has a serious impact on the safety of the buildings, causing uneven settlement, cracking and wall flaking. Expansion is an important factor causing cracking of buildings and spalling of walls, and the damage to buildings can not be neglected, and its controllability is greater than other deformation. Based on the real-time monitoring data and meteorological data, this paper studies the variation law of the wall expansion and the influence of meteorological factors on it. The results show that the meteorological factors have a certain impact on the expansion of Ming dynasty's rampart in Nanjing, indicating that rainfall and temperature have a significant impact on the wall expansion of the Ming dynasty's rampart, and the effect of humidity on the expansion of the wall of the Ming dynasty's rampart is not obvious. Studying the influence of meteorological factors on the wall expansion of the Ming dynasty's rampart has certain reference value for the management and protection of the Ming dynasty's rampart.

Key words: Ming dynasty's rampart, the wall expansion, meteorological factors, precipitation, temperature