In this paper we would like to establish some of the properties of slant and hemislant submanifoldsof an indefinite trans-Sasakian manifold. We have four sections in this paper. Section (1) isintroductory. In Section (2) we recall some necessary details of an indefinite trans-Sasakian manifold.In Section (3) we have obtained some interesting properties on a totally umbilical slant submanifoldsof an indefinite trans-Sasakian manifold. Finally, in Section (4), some results on integrability conditionsof the distributions of hemislant submanifolds of an indefinite trans-Sasakian manifold havebeen obtained.