With the rapid development of computer and network technology, the information of digital multimedia becoming more easily to acquire, at the same time, it also more easily suffer the illegally copying, fabricating, tampering, infringement etc. Digital watermarking is a technology which embedded the invisible secret information in digital products to protect copyright, on condition that it doesn’t affect the digital products quality in use. At present there is not a scientific and reasonable criterion of digital watermarking evaluation. This paper presents an efficient performance evaluation method with imperceptibility, grey relational analysis, which always consists with human visual perception. Experiments show compared to peak signal to noise ratio and some existing methods, the proposed method not only is efficient and universal, but also has a better ability to distinguish tiny details.