This research is a study of the concrete block production. The purpose is to study the appropriate ratios to produce concrete blocks with a mixture of rice straw and rice husk ash with cement Portland and the sand is an ingredient be molded by hand. Size 20x100x20 mm. curing time is 7 days and take samples to test the physical properties. Found that the ratio of the modulus ratio of 100 : 20: 880 is average fracture 11.71 kg per square cm absorption rate is 25.22 percent water and percent change in length 0.03. Of such features can be used in the construction of non-load bearing concrete block fence, such as a fish pond