This article presents two aspects of research into improving the performance of integrated trans-former. The first aspect represents the effect substrate thickness on micro transformer properties. Interleaved structure is simulated using the MATLAB simulator, these results illustrate that improved performance of the interleaved transformer is dependent on increasing the thickness of substrate. However, increasing thickness of the substrate past certain limit does not contribute to improvement of performance the transformer. Second aspect, A study our transformer in terms of thermal behavior and electromagnetic to improviser the performance of the transformer, by using COMSOL Multiphysics 5.3 software, this result illustrates the electrical potential, the current density and the temperature distribution.