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The melt filling difficulty in micro cavity is one of the main challenges for micro-injection molding (MIM).An approach employing ultrasound in MIM was proposed.The approach was extensively studied through experiments with a home-made experimental ultrasonic plastification device.The results of the experiments show that polymer ultrasonic plastification speed increases with ultrasonic supply voltage and plastification pressure.When the ultrasonic supply voltage is 200 V and the plastification pressure is 2.0 MPa,the polymer ultrasonic plastification speed reaches the maximum value of 0.111 1 g/s.The results also indicate that the ultrasonic cavitation effect is the most significant effect of all the three effects during polymer ultrasonic plastification process.