Abstract: Reconfigurable multiprocessor systems offer an approach for improvement of system reliability. On the one hand the faults do not cause the whole system down because of the redundancy of such systems and suitable reconfiguration actions. From the other hand, higher system performance means more processors and other modules, which may result in more faults and a higher risk that system fails. Since classical reliability evaluation technique is not applicable to reconfigurable multiprocessor systems, another approach to reliability evaluation is presented. The result shows that the systems with multibus interconnection are the most reliable among all reconfigurable multiprocessor systems with bus oriented interconnection unit.