The economicefficiency of the production systém and the breeding process is influenced by the population structure, crossbreeding systém and realisation of genetic gain in the offspring. Therefore, the aim of this study was to calculate the economic weight (importance) of traits for pigs included into the national breeding program CZEPIG, taking this information into account. The actual parameters of Czech Large White dam breed and of Pietrain sire breed were implemented in the comprehensive bio-economic model of the program ECOWEIGHT. The position of the breed and its hybrids within the current vertical structure of farms was considered. In both of the evaluated breeds the most economically important traits were the survival of gilts and boars after nursery period (18% and 26%) and feed conversion in fattening (12% and 19%, respectively). Following this, the traits related to health and fertility in the maternal breed and traits related to the production and quality of fattening pigs in sire breed were found as important. Based on the short generation interval in pig breeding, the time delay between the selection of the parental population and the traits expression in their offspring has less influence on the calculated relative economic weights of the traits as it is for example in cattle. Nevertheless, the economic importance in most of the traits calculated formerly was confirmed and the calculation was provided more properly and objectively in both breeds.