In this paper, a multi-agent belief logic named MBL (multi-agent belief logic) is presented firstly. Based on the classical belief logic, MBL is added into the modal operators of every-belief and common belief. Then the Kripke semantics and generalized Aumann semantics of MBL are given, the equivalence of the two semantics, the soundness and completeness of MBL about the two semantics are proved. Secondly, a multi agent probabilistic belief logic named MPBL (multi-agent probabilistic belief logic) is presented. By introducing the probability space on generalized Aumann model, the probabilistic Aumann semantics of MPBL are given, and its soundness about generalized Aumann semantics is proved. At last, some corollaries of MPBL are given.