This research was conducted based on an idea that there are several risks involved in any stocks investments. Therefore, investors usually analize stocks carefully and use fundamental data before they do investments. The aim of this research was to determine the development of condition company financial and aplication of fundamental analyze and Price Earning Ratio (PER) method as the examination on intrinsic value of stock before doing investments in the building construction sector listed in Indonesia Stock Exchange (IDX) during 2010 until 2012 periods. The method of this research used a descriptif quantitative method. The result of this research showed that stocks of PT. Adhi Karya (Persero), Tbk. (ADHI), PT. Jaya Konstruksi Manggala pratama, Tbk. (JKON),and PT. Total Bangun Persada, Tbk. (TOTL) were undervalued, while stocks of PT. Wijaya Karya (Persero), Tbk. (WIKA) was overvalued.