The results of study of low temperature nitrogen plasma action onto to a polypropylene surface are presented. Surface properties were characterized by contact angle measurement followed by surface free energy calculation and Fourier Transform Infrared by Attenuated Total Reflectance (FT-IR/ATR). It was shown, that plasma action resulted in formation onto surface of oxygen and nitrogen containing functional groups and double bonds and accompanied by a surface free energy increase. The double bonds formation allowed one to obtain halogen derivatives of treated films which can be use for next immobilization of other compounds. Results on surface property changes under treated film keeping in ambient air up to 1000 hours are presented.