Behavioral economics can provide more realistic psychological foundations. This book is intended to provide an introduction to the approach and methods of behavioral economics, and to some of its major findings, application, and promising new directions. In this book, it divides part one and part two. In part one, it shall indicate how the process of behaviour economic field develops, then I shall show what methods are used to measure behavioural economy. Next, I shall indicate what the main two categories of behavioural economy are as well as I shall explain what risky and uncertain outcomes of individual behavior economic theories are as well as what behavioral game theory is. Finally, I shall explain behavioral economic principles of policy makers or decision makers as well as I shall also analyze whether behavioral economy and psychology which has close relationship. In part two, I shall indicate underground train and Disney entertainment theme park and University and unground train transportation and environmental protection businessmen etc. enterprises to explain how which can apply psychological methods to predict which client's preferable behavioral choice to achieve economic benefits more easily. Thus, if company or individual businessman can predict labour psychology or client psychologic consumption behavior. Then, which can have more confidence to attract more clients or reduce labour turnover. This book is suitable to any economists or policy makers or individual consumption makers or students or businessmen who have interest to learn how to apply behavioural economy methods to judge to do the most reasonable or the most right economic activities to achieve economic benefit in everyday life.