地道的表达应该是 This is to certify (或declare,state,evidence) 或 we hereby certify!
举例：
CET-6大学英语考试六级证书Certificate of College English TestThis is to certify that ___________,a student of Grade ______ at Department of __________,___________ University/Institute,passed the examination of College English Test Band-6 （CET-6）in January/June XXXX.Upon examination,he/she has fulfilled the band 6 requirements College English Syllabus Band Six with excellent/qualified score and is hereby awarded the Certificate of CET-6.Department of Higher Education State Education Commission （国家教委） 或 Ministry of Education （教育部）Date of Issuance:Certificate No.: