Abstract
The matrix adjoint matrix has the important status in the matrix theory This article embarks from the adjoint matrix basic nature, adiscussion adjoint matrix more profound characteristic and the nature, A further discussion on the adjoint matrix: the rank,the reversibility,the eigenvalue,the adjoint matrix of an adjoint matrix,and adjoint matrices of some special matrices, thus opens up the solution linear algebra question the mentality.
Keywords：adjoint matrix; the rank of matrix; inverse matrix; idempotent matrix; orthogonal matrix
