Abstract: The change in surface morphology and contact angle of the polypropylene(PP) fibers treated by low temperature plasma is discussed.The instrumentation of contact angle measurement based on Wilhelmy technique offers a new approach to measuring the dynamic contact angle of fibers,which can be used to characterize the wettability of the fiber.The relationship between the morphology and the dynamic contact angle of polypropylene fibers treated by plasma was found out through comparative analysis.