  We apply the technique of recollement to study the Gorenstein defect
categories of triangular matrix algebras. First, we construct a left
recollement of Gorenstein defect categories for a triangular matrix algebra
under some conditions, using it, we give a categorical interpretation of the
Gorenstein properties of the triangular matrix algebra obtained by X-W. Chen,
B. L. Xiong and P. Zhang respectively. Second, under some additional
conditions, a recollement of Gorenstein defect categories for a triangular
matrix algebra is constructed. As an application, for a special kind of
triangular matrix algebras, which are called simple gluing algebras, we
describe their singularity categories and Gorenstein defect categories.
