New type ultrasound diagnostic equipments with new functions like color Doppler imaging, harmonic imaging, 3 dimensional imaging etc. tend to irradiate higher intensity ultrasound with high frequency. Therefore the safety became important topic in medical ultrasound field. We measured the irradiated ultrasound pulse waveform, acoustic field and -12 dB output beam dimensions. The mechanical index MI, soft-tissue thermal index TIS and cranial-bone thermal index TIC were calculated from the results. The mechanical index can be calculated from attenuated peak-rarefactional acoustic pressure Pr,α divided by the square root of acoustic working frequency fawf. And they were divided by CMI. The soft-tissue thermal index can be calculated from the output power P multiplied by acoustic working frequency. And they were divided by CTIS1. In this case, CMI is defined as 1 MPa MHz-1/2 and CTIS1 is defined as 210 mW MHz in JIS T 0601-2-37: 2005 and IEC 62359 Ed. 1.0: 2005. Harmonic components with many different frequencies are generated by propagation of ultrasound in water and tissues or nonlinear behavior of micro bubble in the ultrasound diagnosis like tissue harmonic imaging or contrast harmonic imaging methods. These frequency components are different from the transmitting frequency and the fundamental frequency. Therefore it is difficult to determine the acoustic working frequency in the measured frequency spectrum for calculation of safety indexes by conventional definition. We will report about this important problem. New type ultrasound diagnostic equipments with new functions like color Doppler imaging, harmonic imaging, 3 dimensional imaging etc. tend to irradiate higher intensity ultrasound with high frequency. Therefore the safety became important topic in medical ultrasound field. We measured the irradiated ultrasound pulse waveform, acoustic field and -12 dB output beam dimensions. The mechanical index MI, soft-tissue thermal index TIS and cranial-bone thermal index TIC were calculated from the results. The mechanical index can be calculated from attenuated peak-rarefactional acoustic pressure Pr,α divided by the square root of acoustic working frequency fawf. And they were divided by CMI. The soft-tissue thermal index can be calculated from the output power P multiplied by acoustic working frequency. And they were divided by CTIS1. In this case, CMI is defined as 1 MPa MHz-1/2 and CTIS1 is defined as 210 mW MHz in JIS T 0601-2-37: 2005 and IEC 62359 Ed. 1.0: 2005. Harmonic components with many different frequencies are generated by propagation of ultrasound in water and tissues or nonlinear behavior of micro bubble in the ultrasound diagnosis like tissue harmonic imaging or contrast harmonic imaging methods. These frequency components are different from the transmitting frequency and the fundamental frequency. Therefore it is difficult to determine the acoustic working frequency in the measured frequency spectrum for calculation of safety indexes by conventional definition. We will report about this important problem.