Abstract: The present invention provides a color testing system for testing intensities of color output from a screen of a display device. The color testing system comprises a reading probe for reading color output from the screen of the display device, a display equipment, and a color analyzer connected to the reading probe for analyzing the intensities of the color output from the screen of the display device. When testing the display device, the color analyzer will display a screen graph and a cursor on the display equipment corresponding to a next testing area on the screen according to a predetermined test track. The screen graph and the cursor will direct an operator to move the reading probe on the screen of the display device so that the reading probe can properly read the color output of each testing area along the test track on the screen of the display device.