Many of Batak Toba tradisional house are still found in Pulau Samosir and other areas in North Sumatera. When studying the techniques of this traditional house structure design, we have great admiraton for the creativity our ancestors. All materials come from the natural environment where they lives, as well as building technique have been taking into account the various effects caused by the earthquake and fire has been well anticipated. Beside that , all the ellements of building and decorative art which have been drawn by high philosophical meaning. as technology development, the building materials are easier to get so the building of tradisional house was increasingly abondoned.