NOVELTY - The method comprises applying a halide to a substrate, applying a dispersing solution, which contains fine silver particles in a water-based dispersing medium, to the substrate via the halide, and heating the substrate at 60-200 degrees C for 0.1-5 seconds to carry out calcination for forming a silver conductive film on the substrate. The chlorine compound is present in an amount of 0.1-1 g/m2 with respect to the area of the substrate on which the silver conductive film is formed. The content of fine silver particles in the dispersing solution is 30-70 wt.%, preferably 40-65 wt.%.    USE - The method is useful for producing a silver conductive film (claimed), which is useful for forming conductive circuits of electronic parts such as radio frequency identification (RFID) antenna, printed CPU, printed lightings, printed tags, all-printed displays, sensors, print circuit boards, organic solar cells, electronic books, nano-imprint LEDs, liquid crystal display panels, plasma display panels, and printed memories.    ADVANTAGE - The method is capable of producing the silver conductive film having excellent conductivity, by sintering fine silver particles with each other even if a heat treatment is carried out at a low temperature for a short period of time.    DETAILED DESCRIPTION - The method comprises applying a halide to a substrate, applying a dispersing solution, which contains fine silver particles in a water-based dispersing medium, to the substrate via the halide, and heating the substrate at 60-200 degrees C for 0.1-5 seconds to carry out calcination for forming a silver conductive film on the substrate. The chlorine compound is present in an amount of 0.1-1 g/m2 with respect to the area of the substrate on which the silver conductive film is formed. The content of fine silver particles in the dispersing solution is 30-70 wt.%, preferably 40-65 wt.%. The water-based dispersing medium is a solvent containing greater than 50 wt.% of water. The fine silver particles have an average particle diameter of 1-100 nm. The applying step of the fine silver particle dispersing solution to the substrate is carried out by flexographic printing. The heating step is carried out by infrared or far-infrared with heat energy of 30-500 J. The applying step of the dispersing solution and the subsequent calcination are carried out by a continuous roll-to-roll system.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic plan view of a shape of a water based silver ink applied to a substrate.    IC chip mounting portion (11)    Substrates. (D, E)