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Sharing digital documents among multiple users on large tabletop is one of the typical application scenarios for tabletop systems. In this paper, we elaborate the guidelines of designing user interface for this application scenario. A set of finger gestures are then defined into the interface which includes single finger operation for selecting, moving and delivering a digital document among multiple users, double finger operation for resizing and rotating a digital document, trajectory operation for creating and deleting a user working area, creating, deleting and copying a digital document. A prototype tabletop application called JuTable is developed to explore these gestures. At last, we make a discussion on learnability, usability and naturalness of our interface design for this application scenario.