Abstract: The people of Northeast Thailand have strong beliefs in horoscope and have unique traditional methods in Building houses in order to bring good fortune to the occupants. On the other hand, the determinations of the horoscope of Isan House was the measurement or specify the portion of the house’s main structure, for example, pillars, stairs, floor, door bolts and katod. These determine used organs of the owner’s body to measure, for example, hand, foot, finger, elbow, arm and trunk. It could be said that Isan house in the past was specified with the owner because of using their body to measure. Moreover, the construction of Isan people was changed because of capitalism and the expanded of the townspeople. The determination of the horoscope of Isan House was not admired and used the same as the past. The mathematic hidden in the determination was also disappeared.