  Suppose that two compact manifolds $X, X'$ are connected by a sequence of
Mukai flops. In this paper, we construct a ring isomorphism between cohomology
ring of $X$ and $X'$. Using the local mirror symmetry technique, we prove that
the quantum corrected products on $X, X'$ are the ordinary intersection
products. Furthermore, $X, X'$ have isomorphic Ruan cohomology. i.e. we proved
the cohomological minimal model conjecture proposed by Ruan.
