Economical CO_2 reduction will be possible to use the combination system of photovoltaic power generation (PV) and Electric vehicles (EV). In order to spread the EV, it's necessary to solve some problems which are high energy consumption of air-conditioner, high cost of storage battery and risk aversion of a dead battery. In this paper, the authors have proposed and studied an Integrated Electric Vehicle with air-conditioning system (ITEV) which is installed a small engine to supply the power of air-conditioner. As a result, the engine power requires 120cc or less displacement which is smaller than conventional PHV (plug-in hybrid Vehicle) and possible to be a co-generation system to drive air-conditioner. So, ITEV is proposed a practicable solution of the current EV.