Abstract: The multi-functional ultrasonic imaging logging tool can be used for casing inspection and cement bonding evaluation by using ultrasonic pulse echo technique. The field data measured by the MUIL shows that the reflection wave will be firstly received by transducer and then is the resonance wave. The character of spectrum trap is visible obviously in frequency spectrum curve of waveform. The casing's internal conditions can be inspected from the echo amplitude and transit time. The casing thickness and the cement impedance can be calculated from the resonance frequency and resonance decay. It shows that this tool can evaluate the geologic feature information,such as fracture,vug and bedding structure in the opened-hole. Weather the component of material behind casing is gas, liquid or solid can be curtained based on the variable range of cement impedance. The measurement result shows that this tool has the function of borehole imaging, casing inspection and cement bonding evaluation.