The data construction is the construction relation of the data.It is concrete to come to say, it include the logic construction of the data with the physics construction of the data.The data calculate way in the construction have no an applied － for not at, this thesis studies primarily second fork trees bank management system in the application in the fulfillment.Two fork trees is data construction inside an important tree construction, it have many good kinds to mean with the simple physics.
【 Key Words】 :Inside preface, row preface, check to seek, index, left son tree, right son tree, left child, right child, saving construction, complete two fork tree, cent door
