The invention relates to a method and 
system for detecting heat dissipation uniformity of an 
LED display device. The method for detecting heat dissipation uniformity of the 
LED display device includes the steps that the 
LED display device is controlled to display a first 
monochrome picture, a second 
monochrome picture and a third 
monochrome picture; the first monochrome picture displayed by the LED 
display device is shot multiple times according to the first preset time interval, the second monochrome picture displayed by the LED 
display device is shot multiple times according to the second preset time interval, the third monochrome picture displayed by the LED 
display device is shot multiple times according to the third preset time interval, and then a plurality of first images for detection and corresponding to different moments, a plurality of second images for detection and corresponding to different moments and a plurality of third images for detection and corresponding to different moments are acquired; the first images for detection, the second images for detection and the third images for detection are analyzed and processed, and then brightness decay information of a plurality of 
LED lamp points in the first color, a plurality of 
LED lamp points in the second color and a plurality of 
LED lamp points in the third color is acquired; according to the distribution situation of the brightness decay information of the LED lamp points in the first color, the LED lamp points in the second color and the LED lamp points in the third color, heat dissipation uniformity of the LED display device is evaluated. By means of the characteristic that LED brightness decay is related to the temperature, the temperature distribution situation in the display process of the LED display device is indirectly acquired, and therefore heat dissipation uniformity is detected.