This thesis is the study about architectural sculpture in american art since late20th century focusing on works of Robert Smithson and Nancy Holt. Archtecturalsculpture is postmodernist sculpture looked like architecture and architecture;s scalebeing in actual space. Architectural sculpture installed in actual space have site-specific. RobertSmithson and Nancy Holt made large scale outdoor sculpture imbued with theirsurrounding. Their works evolved out of their site with consideration given to thetopography, built environment, and local materials, along with the psychology,sociology, and history of each place.It is possible that art can be integrated into society. It can be place to rest.Architectural sculpture fused with its environment can give social meanings andfunctions to the public. Architectural sculpture has interior space which inspired byshelter. Achitectural sculpture was informed by a counter cultural urge to carryoutside the precincts of the art world. it was also influenced by feminism. Feministsclaimed that it was natural for women sculptors to be attracted to image of shelter.Lucy Lippard suggested that the biological and sexual roots of “sheter sculpture”, asshe labeled it, were in the female body. Architertural sculpture is ecological. they concerned about environmental preservation. In particular, Smithson maintains that art could mediate between theecologist and the industrialist so he set up sculpture as land reclamation. Theconcept of sculpture as land reclamation was presented in some earthworks ofRobert Smithson’s Spiral Jetty, Broken Circle, and Spiral Hill in Emmen, Holland.Smithson’s intent in those works was to focus on the process of entropy. Smithsonbegan to think directly of land reclamation art and made attempts to work withmining companies and quarry owners. He thought that art should not be consideredas merely a luxury but should work within the process of actual production andreclamation.