  In this article, the comodule structure of Chow rings of Flag manifolds
$\operatorname{CH}(G/B)$ is described by Schubert cells. Its equivariant
version gives rise to a Hopf structure of the equivariant cohomology of flag
manifolds $H^*_B(G/B)$. We get two identities of generalized Schubert
polynomials as explanations of the geometric facts.
