In order to improve the positioning accuracy of blind pixels in Infrared Ray Focus Plane Array (IRFPA), the principle of blind pixels appearance was analyzed in this paper. The environment temperature affected the detection capability of effective pixels, quantity and position of blind pixels. Therefore, the algorithm of blind pixels detection for IRFPA considering different environment temperature was proposed. The purpose of the algorithm was to position blind pixels and get quantity of blind pixels in different temperature ranges accurately. The results of experiment indicate that the algorithm can detect the changes of the positions of blind pixels with the environment temperature.