This paper analyzed the current conditions and proposed treatment recommendations as well as testing programs for Moores Family Vault,a Gothic style vault monument belonging to William Hill Moore(1804-1887),the co-founder of the Woodlands Cemetery in Philadelphia,USA.In 1868,Moore had commissioned architect John Kutts to create the Gothic design for a large monument on his intended gravesite.This vault was intended as an advertisement of his business and the most elaborated private monument on the ground.It is a typical gothic structure towering high,with marvelous finish to the pinnacles.According to the archival research,several records of maintenance were found,mainly including two major campaigns: removal of the iron fence and reconstruction of the monument.There was no detailed description about the reconstruction,however,clues could be found on the vault where the spire showed a lighter white color which probably indicated a later replacement.In this study the primary materials identified on the vault are granite at the base and marble used for the vault.Confirmation was made by examining thin-section of the stone.Generally,the granite base remained a relatively good state while the marble monument was undergoing severe erosion.It could be obviously seen that among the four facades,the west and the north fa?ades underwent the most serious deterioration.These two directions received less sunlight and were the territory for water and water related features,such as biological growth.Several chemical products were suggested,such as D/2 used for biological cleaning and Jahn used for micro grout injection and repointing.Finally,all the determination mechanism on the monument were identified according to international standard ICOMOS-ISCS and provide treatment suggestions based on lab tests.It is hoped the results and methods of this study will be helpful for the masonry conservation in other places including China in the future.