In This study, we made the design condition for setting reference value by comprehensive application content to the design of each element. It is intended, then provide the article of this study geothermal system when construct new building designer can use design condition more efficiently. Therefore, it is possible to plan for domestic geothermal system, through utilization at design time, to provide as a good article that can predict the approximate load. Thus, provided the basic design condition that can predict the capacity of the geothermal system. It will be the first step to solve the problem.