Abstract: Effects of array parameters on beam focusing performance are simulated and analyzed by establishing a mathematical model of the acoustic field of one-dimensional linear transducer array,which is widely used in ultrasonic nondestructive testing.The directivity function of the transducer array is introduced,then several methods to improve the acoustic field of the transducer array are presented.Finally,experiments are conducted to test the acoustic field of the transducer array with optimized parameters,and the result shows that it has good beam focusing performance,which provides a reference for transducer selection in phased array defects inspection.