We have been improving upon the method of preparing gold particles in gelatin layer using photographic materials. Then after baking the gold particle layer we obtained the image made of gold layer on the glass plate. Two processes proceed on the baking, one is burning out of gelatine and the other is melting of the gold particle. We analyze the change of gelatine and gold particle on the baking process with AFM and reflection spectra. It got that gold particle layer melted atupper than 500°C, and flat gold layer formed at raising temperature rate of lower than 25°C/h.