Electronic records metadata is one of the means to ensure the authenticity, reliability, integrity and availability of electronic records. Ensuring the authenticity of electronic records metadata is the premise to prove the authenticity of electronic records. The value of some metadata of digital photographic records comes from EXIF, and the information in EXIF is easy to be modified. Therefore, the authenticity of the sub metadata M44 （Device Manufacturer）and M45（Device Model Number）of M43（Capture Device）is detected by electronic photo source detection technology. At the same time, the authenticity of the sub metadata M57（Image Height）and M58（Image Width）of M54（Image Parameter）is detected by using the correlation of the electronic photo's own information. It is hopes that these studies will attract attention to the authenticity of electronic records metadata and provide new ideas and methods for solving the problem of reliable source of electronic records.