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The analytical solution obtained from a variable coefficient Korteweg de Vries equation can be successfully used to explain the evolution of atmospheric dipole type blocking (DB) life cycle.Analytical diagnoses show that basic westerly has great influence on evolution of DB during its life cycle.Weak westerly is necessary for blocking development and the high/low centers of DB decrease and move southward and westward, the horizontal scale enlarges and meridional span reduces, as well as the blocking life period shortens accompanying with the enhanced westerly.Shear of the basic westerly also plays important role on evolution of blocking.