Meiyuan Stone,widespread in the Ningbo area,has a long history of usage dating back to the Western Jin Dynasty.Because of its superior workability,it has been widely used as a building and stone carving material.In many cases,stonework displayed out of doors has undergone serious deterioration because of a number of factors.Several representative cultural heritage sites were selected for analysis,including the Qing’an Commercial Guild Hall and Dongqian Lake Stone Inscriptions.It was found that Meiyuan Stone is a tuffaceous sandstone of high porosity.Biodeterioration,weathering,mechanical disruption and surface deposits are the major causes of deterioration,although the stone’s material properties and preservation environment are closely involved,too.Based on the survey,a preliminary conservation plan is provided.This information will be useful for future research on conservation materials and methods for Meiyuan Stone.