In view of the causes and harm for over-packaging, the judging method should be considered these factors such as commodity category, consumer psychology, environment protection, resource utilization and so on after analyzing on regulations and measurements against over-packaging products. It also presents consequently the conception of appropriate packaging and demonstrates the contents and operation principles. The suggestion of making data draft treatment on value，volume，and material by normal distribution are very important to judge over-packaging. It is also efficient and practicable to set up criterion quantity factor g0 and criterion parameter Xg for over-packaging.