Abstract: PVM (Parallel Virtual Machine) is a software box which enables us to make a parallel virtual machine that includes a network of homogenous and non-homogenous computers. The general purpose of PVM system is to create cooperation between network computers for doing the distributed computation in simultaneous or parallel form. In this study we intend to do the matrixes multiplication problem in parallel form, for doing this work, we need a network of computers that due to the ease of work we use of wireless network (ad hoc). Wireless network (ad hoc) is a non-concentrated wireless network that each node of network (network member) sends data for next nodes and the decision for sending the data to the next node is made in dynamic form according to the quality of connection to the network for that node by the node itself. This is the difference point of this kind of network with wired networks in which routers do the operation of routing and sending the data. At first we launch ad hoc network with several computers, then we run the matrix multiplication algorithm with PVM system on this network. At the end of the study, the results obtained from parallel processing and processing in serial form have been studied.