Abstract: An ultrasonic cleaner of complex-frequency is designed and studied by using computer simulation, in which three kinds of different frequency transducers are splaced on the same emitting surface of sound wave. The distributions of acoustic field of the complex-frequency and each of single-frequency are explored in high-power scale, the distribution of acoustic field of the complex-frequency is recorded on copper-plate paper by means of aqueous solution of blue dye with ultrasonic radiation. The results show that ultrasonic cleaning of the complex-frequency have three advantages, the characters of acoustic wave of different frequency are displayed full, the standing waves in the acoustic field are eliminated, the acoustic field are well-distributed. An apart from that, it also shows that the cleaning effect of the complex-frequency is better than that of the every single frequency .