Abstract: In this paper, mixed layer depth and some mean elements are predicted using the dry mixed-layer model. Their variations with time and some basic properties are discussed. This model is tested with the data observed during the 1967 Australian Wangara experiment. Comparison of the calculated-results with the observed data is conducted. The aim of this paper is to build a predictive model describing the basic properties of the mixed layer and attempts to formulate a boundary-layer parameterization scheme suitable for NWP model.