Location of the themperature measurement and finding the optimum time were essential in the usage of short wave diathermy (SWD) unit. Therefore, the purpose of this study is to investigate the optimal location and time for SWD exposure. To perform this study, an artificial human body tissue (phantom) which is mimetic to a human arm was developed. Four themperature sensors were placed at the difference location at the phantom to investigate the themperature distribution. The phantom was placed in the varies distance from 30 cm to 50 cm from SWD unit. The results showed that the highest temperature were obtained at the distance of 30 cm with themperature of 39.14oC. At the distance of 50 cm, the themperature was distributed at the optimal time of 15 minute and themperature of 32.16oC. At the distance of 40 cm, it was obtained that the themperature was distributed at 36.7oC.  The average themperature from four different sensors at the location of 30 cm, 40 cm and 50 cm were 39.1oC, 37.1 oC and 32.65 oC respectively. This work showed that the phantom temperature in the SWD exposure were effected by the location of the object from the SWD unit.