摘要：Beam focusing is one of the unique characteristics of ultrasonic phased array compared with conventional *** the basis of two-dimensional radiated sound field of phased array,the three-dimensional radiated sound field was simulated in the paper,and then the effect of different frequencies,different number of array elements and different element spacings on focal spot,the depth of focus and the effect on horizontal and vertical resolution were *** optimal results of transducer parameters have certain reference value for the design of phased array probe.