According to the issues of motor for pumping oil with renewable electric energy underutilization and caused strong bus voltage fluctuation at Direct Current (DC) power supply side, on the basis of the relation model of group control radius, a kind of system design idea of the control and reciprocal power-fed system of group variable frequency motor for pumping oil under multi-transformer in parallel is proposed. The control rule was made that renewable energy being used firstly, and shortage of the power being supplied through network. On these bases, the dynamic mathematic model of rectification system was established, and the control scheme for voltage coordination and power flow of DC bus was designed so as to satisfy the requirement of voltage quality of DC bus. At the same time, the key unit circuits and control functions of the system were designed. Power supply of Alternating Current (AC) and DC shared mode and control unit has the advantages of low modification cost to the oilfield and can satisfy automatic switching security requirements of remote places. Power supply of Alternating Current (AC) and DC shared mode and control unit had the advantages of low modification cost to the oilfield and can satisfy automatic switching security requirements of remote places. Finally, it is proved that the operation characteristics of security and stability and obvious energy saving effects of the designed system through field application and test.