In addition to fiber length, fiber requirements for pulp raw materials also determined by the fiber dimension derived value. Fiber dimension derived value includes Runkel Ratio, Muhlstep Ratio, Flexibility Ratio, and Coefficient of rigidity.The four type of bamboo Runkel ratio in the range of 1.07 to 1.24. Runkel ratio is the ratio of cell wall thickness to lumen diameter. Fibers with Runkel ratio value less than or equal to 1 can be used as a pulp raw material. Four bamboo shave a thickness fiber wall but wide lumen diameter, so it will be easily to refining and easily to fibrillation.