To promote the transaction efficiency of micropayment system. The thought of the binary tree is used to present a new micropayment system based on self-updatable two-dimensional Hash chain. It values specific evaluation to the node, thus the user can complete the transaction by lbN times( N is electronic cash total amount which user can spend). It uses the regeneration method of the multi-Hash chain, and avoids initiation once more by user. Analysis results show its practicability and unforgeability.%为提高微支付系统的交易效率,借鉴二叉树可分的思想,提出一种基于可自更新二维Hash链的微支付系统,对二维Hash链的结点面额进行特定赋值,使用户只需进行lbN次(N是用户需要花费的电子现金总额)Hash计算就能完成交易,利用多维Hash链可自更新的方法避免用户对Hash链再次初始化,从而减少系统的额外开销.理论分析结果证明,该系统具有实用性及不可伪造性.
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