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Objective The electrical properties and mechanical activities of the heart play an important role in the physiological and pathological cardiac research.Therefore, we develop a synchronous monitoring system for electrocardiogram (ECG) and seismocardiogram (SCG) .Methods The detection of ECG is designed by single lead and SCG is obtained by measuring the tri-axial acceleration and the tri-axial angular velocity of the skin surface at chest.A low power consumption microprocessor named STM32 with ARM Cortex-M3 kernel is used to store data to the SD card, or send data to the mobile phone by low-power bluetooth, process data and display waveform.Results ECG and SCG signals of human body are acquired, and the results show that the system can collect, transmit and display the signals of ECG and SCG with high signal-to-noise ratio in real time, and the system can complete the record of signals over a long period of time.Conclusions The monitoring system is portable and easy to operation, and can work steadily for a long time.This work makes the foundation for further analysis of the coupling relationship between the electrical activities and the mechanical activities of the heart.