It is necessary to reconstruct the classification system for contractual legal binding force, because the system is not scientific enough at present. The system should be divided into three categories or five kinds. Valid contracts(in a broad sense) have legal binding force,and include valid contracts(in a narrow sense) established according to law and contracts which can be revoked. Uncertain contracts have legal binding force which is pending. Invalid contracts(in a broad sense) do not have no legal binding force,and include absolutely-invalid contracts(in a narrow sense) and relatively-invalid contracts. Such a three-category or five-kind system is based on the legal binding force as basis for reconstruction,and differs from the present classification systems which is based on the legal effect for construction. According to this new system,contract legal binding force comes before contract legal effect,so we should liberate the former from the latter,and admit that the former,which differs from either contract establishment or contract effect,is an independent layer after contract is established and before it takes effect.%现有的合同效力类型体系不够科学，有必要重构。合同的效力类型应划分为三类五种。合同有效（广义）包括依法成立的合同的有效（狭义）和可撤销合同的有效，合同有效指合同具有法律约束力。合同效力待定实为合同的法律约束力待定。合同无效（广义）包括合同绝对无效（狭义）和合同相对无效，合同无效指合同无法律约束力。此“三类五种体系”始终以合同的“法律约束力”为基点，与现有的以“生效”为基点的合同效力类型体系截然有别。该体系还表明，合同有效乃生效的必要前提。我们应当将合同有效从合同生效论的长期桎梏中解放出来，承认合同有效乃介于合同成立与合同生效之间的独立的效力层次。
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