In part one, I shall explain what behavioral economy mean and function is, and I shall indicate some examples of behavioral economy method.In part two, I shall indicate how to apply behavioral economy methods to attempt to predict Disney visitor's behavioral choice to visit, university student behavioral choice to study, underground train MTR's passenger's behavioral choice what transportation tool to catch, airline passenger's behavioral choice which airline to buy airticket to catch airplane and environment protection product buyer's behavioral choice to buy any kind of environmental product reasons.