The book is [mental result] written by Phd. Wan Jiahui by analyzing some researches of foreign psychology experts and by combining with current social condition of Hong Kong in recent years.Phd. Wan has engaged on psychology counseling for more than twenty years and once taught psychology in several universities in Hong Kong and Australia and takes office in university in Hong Kong now.He thinks that general readers are only [users] of research results; therefore, he hopes to introduce some psychology research result for us by simple language, so that these findings to improve life level can be known by more ordinary people.