Energy-saving architecture is based on the idea of minimizing energy use with science and cutting-edge technology. Nipah leaves is used as a composite material is one of the alternative use of energy-efficient building materials, available enough, and safe for the environment. This research is aimed to know the nipah leaf physical capability when it is done tensile test and bending test to composite material. Tensile and bending tests are the methods used in this study. Based on the result of the test on nipah composite material reinforced polyester resin concluded that the highest composite tensile strength on test specimen number (4) is 31.3073 N/mm 2 . The lowest tensile stress on test specimen number (1) is 15.4616 N/mm 2 . The greatest bending strength on test specimen number (2) is 3.3674 N/mm 2 . The lowest bending stress on test specimen number (1) is 0.50372 N/mm 2 . Composite board material made from nipah leaf has good tensile physical properties and bending is still needed the right mix formula.