A control and communication system is designed for he 8arm MicroResistivity Scanning Imaging Tool. Based on DSP TMS320F2812, the system is able to decode the downlink commands from ground , to communicate with the other circuit modules, to control the acquisition of auxiliary data and to package and upload the logging data. The hardware design of the system takes advantage of DSP’s serial interfaces to simplify circuit structure and makes the system small enough for the narrow space of the logging tool. Meanwhile, the control processes and procedures are considered. The well logging data show that the system is reliable and could meet the demand of microresistivity scanning imaginglog.