Abstract：Ultrasonic imaging technology is a remarkable new technology in modern nondestructive testing (NDT)

however

the main problem is that its resolution is lower at present

especially transverse resolution

directly affecting the application value of ultrasonic image. Aiming at the application characteristics for ultrasound image

for obtaining contrast test

making several experiments with the methods proposed based on combining interpolation and wavelet image fusion which are used to process ultrasonic images

results indicate that: it is feasible for improving the resolution of ultrasound image with the method of comparing the region energy to determine in which image the object is clear，The wavelet decomposition is used to decompose images interpolated to two different parts

namely

the low frequency part and high frequency part

then the low frequency part is processed with the method of average

and the high frequency part with the largest region energy

finally

better results have achieved from application of this method to improve the resolution of ultrasound images.