履约保函是一种由银行或保险公司出具的担保文件，用于保证主合同中承包方履约。它可以作为主合同项下的支付担保，防止因承包方违约而引起的损失。本文将提供履约保函的中英文模板，供业界参考使用。
兹经发包人（以下称甲方）要求承包人（以下称乙方）按照《建设工程施工合同》（合同编号：_________ ）（以下称主合同）的约定，在主合同项下承担义务。乙方已向甲方提交履约担保金，甲方已确认收到履约担保金。
为确保乙方按照主合同的约定履行义务，甲方要求乙方提供履约保函。乙方委托_________（以下称保函人）作为担保人，特此出具本履约保函。
兹保证：如乙方未按照主合同的约定履行义务，导致甲方遭受损失，保函人应在收到甲方书面索赔通知后_________日内，向甲方支付索赔金额，不超过本履约保函项下保额_________元。
本履约保函自_________年_________月_________日起生效，至_________年_________月_________日止。在主合同项下的义务履行完毕且甲方未向保函人提出索赔要求之前，本保函自动失效。
本履约保函的解释和履行，均适用中华人民共和国法律。
特此保函。
保函人：_________ [保函人签名] _________年_________月_________日
WHEREAS, the Principal has requested the Obligor (hereinafter referred to as the Contractor) to execute the Contract (Contract No._________ ) (hereinafter referred to as the "Principal Contract") and has entered into the Principal Contract dated [Insert Date]
AND WHEREAS, Contractor has furnished a performance bond to the Principal, the receipt of which is hereby acknowledged by the Principal.
AND WHEREAS, the Principal requires that the Contractor furnish the Principal with a performance bond for the purpose of securing performance of the Contractor's obligations under the Principal Contract.
NOW THEREFORE, in consideration of the foregoing, the Surety, at the request of the Contractor, hereby irrevocably and unconditionally guarantees to the Principal as follows:
1. If the Contractor shall fail to perform its obligations under the Principal Contract in accordance with the terms and conditions thereof, and the Principal suffers any loss or damage by reason thereof, the Surety shall pay to the Principal an amount not exceeding the Surety's liability under this Performance Bond, upon receipt of written notice of such failure by the Principal, within [Insert Number] days of the date of such notice.
2. This Performance Bond shall be effective from _________and shall continue in full force and effect until the obligations of the Contractor under the Principal Contract have been performed in full and the Principal has not made any claims against the Surety under this Performance Bond.
3. This Performance Bond shall be governed by and construed in accordance with the laws of the People's Republic of China.
IN WITNESS WHEREOF, the Surety has caused this Performance Bond to be executed by its duly authorized representative as of the day and year first above written.
Surety: _________ [Surety's Signature] Date: _________.
使用履约保函模板时，请根据实际情况修改以下内容：
主合同编号和日期 发包人名称和地址 承包人名称和地址 履约保函金额 履约保函生效和失效日期 索赔通知期 保函人名称和地址建议在使用模板前咨询法律人士，以确保模板符合特定交易或项目的需要。
履约保函的有效期一般与主合同的期限一致，但也可以根据实际需要进行调整。
履约保函的保额一般为合同金额的5%至10%，但也可以根据项目规模、承包方的信用状况等因素进行调整。
履约保函原则上不可转让，但经发包人、承包人和保函人同意后，可以进行转让。
履约保函的索赔时效一般为自承包方违约之日起一年内，但也可以根据主合同或保函规定进行调整。
履约保函是工程建设中重要的担保措施，在保障项目顺利实施和发包人利益方面发挥着重要作用。使用中英文履约保函模板可以简化担保流程，提高履约效率，为工程项目保驾护航。
