The purpose of this study is to measure the temperature distribution of focused energy by infra-red soldering machine. The result indicate following. 1. The three dimensional heating area is an ellipse shape, and soldering area is about 10 mm in diameter centering around the focus. 2. Temperature adjustment of INFRARED (NEY Co.) is to use Powerlevel, and of BEAMWERDER (YOSHIDA Co.) is adjusting the height of the turn table. 3. When soldering with focused energy with infra-red machine, it is adequate to solder at the focused level or the upper level, after pre-heating of the soldering objects at the lower level.