Proceeding of the Joint International Symposium on Deformatuon Monitoring. 2-4 November, 2011. Hong Kong. China. Report. It's elaborated the method to measure subsidence measurements of protected buildings using digital levels, tilt measurements using total stations and displacement measurements using GNSS in this presentation. And it's truly concluded that the deformation only can be calculated correctly by processing multiple observations and data fusion from different kinds of measurements.