The standards of demand, diversity and load density are necessary to create the design of a transformer capacity that is seldom presented in terms for academic study. At the moment, both legal and institutional standards for such a transformer are insufficient both at home and abroad. The works described in this thesis strongly support more reasonable standards for calculating transformer capacity by correlating the analysis between the maximum utilization factors of a given transformer with those of a transformer capacity whose power consumption has been investigated within a lease apartment. In this dissertation, it is necessary to analyze the key features and general trend from the investigated data. It made an analysis of the feature parameters, such as average, standard deviation, median, maximum, minimun and thus it was carried by the linear and nonlinear regression analysis.