Abstract: In order to study the frost growth morphology, a visualization platform is set up. By using the platform, a series of experiments are carried out to study the frost deposited on a vertical flat copper plate in the atmospheric pressure and in vacuum, respectively. The plate is cooled by the liquid nitrogen and controlled at a temperature of -180 ℃. It is shown that under the atmospheric pressure and cryogenic temperature conditions, the initial nucleation tends to take place on the edge of the cold plate, then the frost grow downward along the plate surface with a growth rate of about 0.3 mm per minute. The growth rate in parallel to the cold plate direction is significantly greater than that in the perpendicular direction; under vacuum and cryogenic temperature conditions, the frost is in the form of solid particles and grows very slowly, to reach a uniform distribution on the plate. Cracks are found in the frosting process. The clear frosting images provided by the platform are expected to be used for investigating the frosting mechanism in the future.