The invention provides a method for utilizing color developing agent 4,6-dichloro-5-pyrimidine formaldehyde and 502 glue to perform fuming so as to display latent fingerprints on the surface of an object. The technical scheme is that the method comprises the steps of well hanging the object with the latent fingerprints in a fuming box, heating a heater to a certain temperature, placing a mixture of the color developing agent and the 502 glue on the heater, and then sealing the fuming box. The color developing agent and the 502 glue serve as gas to be volatilized, polymerization occurs when the gas is met with the fingerprints, and the light yellow fingerprints are displayed. The method has the advantages of being simple, rapid and easy to operate and the like, the latent fingerprints on various different surfaces can be displayed, and the latent fingerprints on light-colored objects can also be displayed.