Abstract: In order to fill the cavity with a mould, entering metal must have heat required. The reduction in the temperature of the fluid passing by the system of release must be adapted in the treatment in order to make it possible the liquid to completely fill the interstices of the mould. The use of the fluidity of the molten metal like concept and variable of treatment to define the conditions of payment of metal was constant in the technical literature. Basic tests are employed to determine this parameter of thermal transfer in liquid metal operations, provided an occasion more particularly to define the behaviour of the molten metals in the moulds filled. These concepts presented by researchers, consider the loss of temperature of the molten metal while it crosses the system of release. The development of this model is based on a calculation of the loss of heat of the molten metal are equivalent to a tube with the models of release of these systems which accentuate by the unstable nature of the loss of heat reviewed. The computer simulation of this analysis was described by other researchers. The development of a model of unstable state is given where the system of release is simplified with an equivalent tunnel of flow by material of the mould. Local flows of heat are a function of time and the temperature of each metal increment can be given as soon as it enters the mould. The loss of heat in the system of release is the first stage by determining a first distribution of the temperature in the mould for the computer simulation of the concepts of solidification of the mould similar to those used to evaluate the loss of heat in the system of release can be employed to determine the initial temperature in the mould on the achievement of the filling of the mould. The incorporation of these concepts in the computer-aided design for moulds is necessary. What relates to the molten metal, Holman for example presented an analysis for the loss of the temperature by holding molten steel which is applicable to other metals.This review presented developments by quantitatively evaluating the losses of heat in the filling of the mould. It would prove that the quantitative aspects of the thermal transfer in the treatment of the molten metal were developed and checked in experiments. The current task is to integrate these results and to install them in a system computerized for the design of the mould of production. The fall of the temperature of the molten metal in the mould is taken into account. Several concepts and analyses having milked on the subject are presented. The use of the quantitative aspects in the evolution of the simulation computer-assisted for the design of the components is recommended.