Abstract: In this paper, a synchronous cuk converter proposed for analyzing the performance of photovoltaic system is presented. In the proposed cuk converter, the conduction losses and switching losses are reduced. The conduction losses are reduced by replacing the diode with MOSFET and the switching losses are reduced by providing an auxiliary circuit. The proposed converter system is operated based on the soft switching techniques. These switching techniques are to provide smooth transition of voltage and current. So, the conversion efficiency of the PV system is improved and the load meeting the dynamic energy requirement is in an efficient way. It has a significant advantage over other inverting topologies since they enable low voltage ripple on both the input and the output sides of the converter. Then, the different operation mode of proposed synchronous cuk converter is analyzed at different operating condition of auxiliary and main circuit. From the operating mode, the output current of each modes are determined. The proposed synchronous cuk converter implemented in MATLAB simulation platform and the output performance is analyzed.