Abstract: Bemre the Qin Dynasty, the military strategists already had rich psychological ideas in making strategic decisions．Their main points are as follws．1．Know the enemy and yourself, then you can fight a hundred battles with no danger ot defeat,this shows the psychological idea in overall information managing， 2．Get all－sided information with stratagem． The methods of getting information are：(1) inferences from analysis:(2) observation; (3) the use of spies;(4)reconnaissance. 3.Make careful calculations and full plans, and you'll succeed on sufficient condition of winning victory, otherwise you won' t be able to succeed, this shows the psychological thinking in making strategic decisions． The psychological idea in making decision is aimed at"full victory without fighting"． It Is based on overall information managing and including three principles They are(1)selecting the best method;(2)making changes in tactics according to the enemy 's situation. (3) Changing strategies frequently and fighting with both general principles and special tactics．

Key words: know the enemy and yourself, and you can fight a hundred battles with no danger of defeat, get all－sided information with stratagem, make careful calculations and full plans, and you'll succeed on sufficient condition of winning vi