The temperature of the optical system load is usually low.Low temperature surface is more easily contaminated by the outgassing molecules, which can degrade the performance and lifetime of the optical system load. Based on the diffusion theory and the classical adsorption kinetics theory,we achieve the adhesive depositing model, and then conduct an experiment on the condensation characteristics of adhesive. The experimental data is consistent with the theoretical model.This model can predict and control the contamination on low temperature surface to ensure normal operation of the satellites.