Since the demand for functional clothing becomes more and more pressing, wearable electrocardiogram system is designed here. The electrocardiogram signal is collected by three flexible fabric electrodes with high sensitivity and transmitted through the textile lines with good conductivity. Then, the signal is processed by the simple circuit with AD8232 and STM32F103C8T6. Finally, it is sent to the upper computer via bluetooth, and displays with the electrocardiogram waveform in real time. To remove the motion artifact interference, resulting from the great range of movement, a motion artifact interference suppression algorithm is proposed by combining the empirical mode decomposition with the principal component analysis. Experimental results show that the system can monitor the human body's electrocardiogram in different states effectively.