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A new integrated device is put forward to monitor harmonic pollution. This system takes a 8-bit microcontroller MPC860 chip, a PowerPC TM real time system controller that produced by Motorola's company as the nucleus and is composed of multi-channels data synchronous acquisition system in the Capacitor Voltage Transformer (CVT), which can suppress the ferromagnetic resonance, satisfy the long-range monitor and show a good frequency response. The harmonic analysis algorithm adopts Fast Fourier Transform (FFT). The measured quantities are analysed and compared with international standards. This new compact system has resolved problems of traditional models with inefficient performance and complicated program. It also can communicate with monitor center through telephone line, serial port and wireless, etc. This new device is carried out in order to identify the sources of harmonics generation, estimate the level of distortion and monitor electric power signal variations very efficiently. Simulation results show the new device helps to facilitate the supervision of electric power signals and many kinds of electric power quality disturbances and harmonic pollution are tested thoroughly.