Wind turbines are complex composite structures, which condition should be constantly tested. In this paper the techniques which are already used or are implementable for non-destructive examination of wind turbine blades will be presented shortly. New electromagnetic techniques like active IR testing or terahertz imaging will be more widely presented and some exemplary results of inspections will be shown. © 2016, Wydawnictwo SIGMA - N O T Sp. z o.o. All rights reserved.