Study on Optimal Ratio of Width-height in Cuboid Split Test

This paper analyzed feasibility of cuboid spilt test by calculation.The relation of tensile strength and cuboid's size were obtained, and the range of cuboid's ratio of width－ height was found in which cuboid spilt test can substitute base test. Tensile strength's error has been analyzed, and predominance has been compared with different ratios of width－ height, and the best ratio of width－ height has been indicated.