The nanometer order optical fiber rpobes are fabricated from ordinary single mode quartz optical fiber with the pulling etching method.The probe was evaporated on the surface by a metal film,whose thickness was tens nanometer order.Then the optical fiber probe had the property of conduct electricity,and could conduct tunnel current.This is a new optical fiber probe for scanning tunnel microscopy (STM),the good experimental results were obtained in STM.The comparison with this new probe to metal probes was given,and the property of this probe was analyzed.