Nowadays, there are so many invented technics for the betterment of production processes one of the best and the strongest of which is of which is an important and effective technic in this field, which starts with specifying an experiment and selection of processes factors.The specifications of Experiment designing process is in such a way that it could be applied for both processes of and promotion(betterment) of products.In this essay, applying experiments technic, the effects of carbon black and oil on hardness range of one type of tire rubbery compound has been studied. After performing the experiments, and specifying the effects of the factors ( and the amount of its effectiveness ) on the response level, the best amount of each factor, for regulating the average effective hardness of the rubbery compound on the assigned target is specified, Comparing the results before and after applying the Experiment designing process, will specify its effectiveness.