Vision based fire detection is potentially a useful technique in large space building. Continuous images are taken from the digital color CCD (charge coupled device) camera. Then the images are processed with an fire detection scheme to determine whether a fire occurs in the vision field. Segmentation of fire from the background requires processing of color image. Once a fire is detected, it will be automatically located, the fire region was calculated. The experiment was conducted in a laboratory-scale large space. The results show that the color image segment approach was able to detect dangerous flames.