Objective To explore the ways and use value of cytodiagnosis of liver parenchyma tumor by ultrasonic intervention.Methods To have cytological examinations for 80 cases with liver parenchyma tumor under B Ultrasound,and compare with picture diagnosis.Results The cytological examinations under B ultrasound show 74 diagnosis are right( 92.50 % ),only 6 diagnosis are wrong(7.50 %),63 ultrasonic picture diagnosis are right(78.75 %).Conclusion Cytodiagnosis of liver parenchyma tumor by ultrasound has the features of high exactness and rapid diagnosis.