Polyethylene pipes have been widely used as they are easy to construct and suitable for economical efficient when they are compared with metal pipelines. This paper studies the effect of various external loadings on stress and deflection of the buried PE pipes using Finite Element Method(FEM). For this purpose, stresses of buried PE pipes are calculated according to the loading condition such as pipe types (pipe diameter $50{sim}400mm$), burial depths ($0.6{sim}1.2m$) and internal pressures ($0.4{sim}4bar$). As a result, it is founded the effect and relation with each of loading conditions under the buried condition.