This paper presents a solution scheme to realize the simple logical analyzer based on digital signals processing and digital storage oscilloscope principle. The system is mainly composed of minimum system of C8051F020 and FPGA, ADC converting module, signal attenuation module and TFT TouchScreen. The design uses single stage and third stage trigger. Meanwhile, the system can collect 8 channels of analog signals, trigger and storage. The experiment indicates that system has the advantages ofhighspeed test, multichannel input, multimode triggers.