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There are many different kinds of instability types.In subtropics, the development of a synoptic system is associated with baroclinic instability.In tropic,the development of a synoptic system isassociated with barotropic instability.The theory of baroclinic instability is well developed which is related to the temperature gradient.The barotropic instability is influenced by the horizontal wind shear. And its necessary condition is that the absolute vorticity of mean wind flow at somewhere equal to zero.If anywhere there issatisfying the necessary condition weather the disturbance is developed or undeveloped. It must be also depend on the basic flow not all the condition absolute vorticity ,could become barotropic instability. Except the absolute vorticity equal zero, and the basic flow must satisfy and the wave speed relative to the mean flow.