Abstract: In this paper, remote sensing technology is applied to the monitoring of the dynamic changes of cultural heritage. Based on multi-temporal digital orthophoto map(DOM) images, the multi-band difference method and the object-oriented post-classification change detection method are used to monitor the dynamic changes of the Precious Belt Bridge in Suzhou. Experimental results show that both methods can be applied to the dynamic change detection of cultural heritage, and the object-oriented post-classification change detection method is more effective for continuous and large-scale change of ground objects, while multi-band difference method is more sensitive to discrete ground object changes. The research results in this paper can provide ideas for the intelligent monitoring and protection of the cultural heritage in our country, which is have certain promotion value.