Abstract: It is significant to the decentralized sewage disposal of the countryside by combining the johkasou with solar micro power technology． In order to improve the utilization of johkasou，the basic principles，process characteristics，maintenance management system and applications of sewage-treatment technology were studied，and the feasibility of solar micro-power technology applications was analyzed． It was proposed that presented insufficient and recommendations that consisted in applications of johkasou combined with solar micro-power technology for rural decentralized sewage treatment．