Aiming for the structure feature of the airfield runway,a new airfield runway recognition and center spot extraction algorithm is proposed.Firstly,median filter is used to remove pulse noise.Secondly,the edge image is extracted with sobel operator.Thirdly,all possible line sect are extracted and their parameters are calculated.Fourthly,line extraction result are got by implementing line sect connect test.Finally,parallel lines are searched from all lines,and edges of main runway are recognised,and center spot of runway are calculated.Many experiments show that this method can recognize airfield runway and extract center spot exactly and quickly in the infrared images.