[摘　要]　工程发包方根据己方意愿和利益，常在合同订立和相关项目管理规定中针对承包方制订严厉的违约责任条款，但此类条款多存在不规范、不合理、甚至无效的问题。通过对相关法律条文的诠释与解析，阐述了不规范、不合理、不合规的责任约定的合同效力问题，并就此提出建议。

[关键词]　项目管理；法律合同；违约责任条款；合同效力

Abstract: In the process of project implementation and contract signing, the contractees, usually according to own will and interests,  rule severe liability for breach of terms for contractor in the contract and project management of projects related to the system, but most of these clauses are non-standard, unreasonable，and even ineffective. This article discusses and analyzes the problem of contract effectiveness agreed by non-standard, unreasonable and ineffective clauses，and puts forward personal opinion related to this.

Key words: project management; legal contract; clause about liability for breach; contract effectiveness