Kudla-Rapoport conjecture compares the intersection number of special cycles on unitary Rapoport-Zink spaces associated to a quadratic extension of local fields with local densities of Hermitian forms. Originally their conjecture was only formulated for the good primes. In this talk I will discuss how to modify the conjecture over the ramified primes and present some evidence of the modified conjecture. This is joint work with Qiao He and Tonghai Yang.