1. Computer-assisted method for optimisation of aircraft's avionics platform, said method being intended to implement a set of avionics functions, where each avionics function is associated with one or more software module instances, where any two software module instances can exchange messages by means of a link, called a functional link instance, where said avionics platform additionally comprises equipment linked together by unidirectional or bidirectional physical links which belong to different types of networks, paths used to link said equipment, where each path is made up either of a single direct physical link between an item of source equipment and destination equipment, or of a first physical link between said source equipment and a first network node, a second physical link between said destination equipment and a second network node and a network path between said first and second nodes, characterised in that on the one hand functional link instances are associated with paths intended to implement these instances, by means of a first set of constraints and, on the other hand, software modules instances with equipment intended to host these instances, by means of a second set of constraints, where said constraints of the first and the second sets are formulated as linear inequalities of decision variables, and in that multiple cost functions formulated as linear combinations of at least certain of said decision variables are minimised in order to obtain at least one optimum solution for implementation of the platform.