Indonesia has the largest coconut land in the world with area of 3.88 million hectares producing 3.2 million tons of coconut. It produces a large amount of coir fibre and it is potential as reinforcement of composite material. The country also has large rubber forest land with industry investment opportunity of US $ 3 billion. The investigation of mechanical properties with different composition of coco fibre and rubber is needed to find its optimum properties of the porous natural composite. The specimens were varied in weight fraction between coco fibre and rubber (30:70; 50:50; 70:30). All specimens were tested with tensile testing in longitudinal and transverse direction to get its tensile properties and observed by macro photo. The result shows that the increasing of fibre reduces the strength and strain and it has optimum modulus for 50% fibre. This can be used as engineering consideration in producing of product, such as mattress and carpet.