Abstract: In order to meet the requirements of modern electronic systems, the DC-DC converter needs to have such characteristics as small, light and high reliability. In this paper, a DC-DC converter substrate with embedded inductor is designed by using low temperature co-fired ceramic (LTCC) technology. The embedded power inductor is modeled and simulated, and the DC characteristics are studied with Anosft Maxwell. The input output circuits and feedback circuit have also been designed. At last, a DC-DC converter with the size 20 mm×15 mm×1 mm and the saturation current more than 2 A has been fabricated.