Microstructured polymer optical fiber (MPOF) are rapidly developing as an alternative to conventional polymer optical fiber. They are cheaper and simpler to make,and aslo have a wide varity of new optical properties through tailoring the hole structure imposed on the preform and maintained within the final fiber. However,one important issue that needs resolution to facilitate successful commercialisation is cleaving of the fiber to form an optical ending face for coupling. The impact of the following parameters is considered in cleaving microstructured polymer optical fibers:fiber drawing conditions;temperature of cutting blade,and fiber temperature during cleaving,etc. Optically acceptable MPOF ending faces can be produced by employing a “hot blade/hot fiber” combination.