Prawn is an important aquatic product which has high economic value. The annual output and export volume of prawn are increased in recent years. But because of the shortage of aquatic quality evaluation and grading system, quality of prawn can’t be recognized clearly and the exportation of prawn was affected. In this article, in order to improving our aquatic quality grading system, quality grading systems of foreign countries which were suitable for their agricultural development were discoursed and the importance of aquatic quality evaluation and grading system was analyzed. The quality factors of prawn were reduced to appearance, texture and flavor based on the experiences of quality grading system in foreign countries. The article also summarized the current research hotspots which were developing fast and accurate quality evaluation methods based on sensory test. Quality characters of prawn would be tested objectively using colorimeter, texture analyzer, electronic nose, computer vision and near infrared spectrum analyzer. And intelligent grading methods based on physics and information technology were also mentioned. The article also prospected the development trend of quality evaluation and grading system in prawn products.