It has been found that the particles size, volume fraction of the film-forming sol disperse phase, the pack-density of the particles in the layer, effect on the optical properties of nanodimensional films and composites consisting of a glass substrate coated with the surface film. The threshold energy density of the laser ablation destruction of the films being components of the composites also depends largely on the state of the sol dispersed phase. This value needed for the ablation under the laser radiation with nanosecond pulse duration was found to increase with the dispersed phase particles pack-density in the layer. Moreover, this value increased with the particle size and decreased as the fraction by volume of that phase and particles pack-density rose when using microsecond pulse duration. These relationships are due to low thickness and density of the nanofilm, and as a result the laser beam interacted practically with the dense glass substrate.