To improve the test method for vibration of packaged products based on reliability theory. By defining the average product life expectancy, test end time and failure number, the paper investigated the effect of sample size on the entire test reliability, and the influence of change of the packaging damping and vibration frequency on the vibration amplitude of the specimen. It was necessary to determine the sample size in order to ensure the reliability of the packaged products. If the sample size was too small, the reliability of this batch of samples could not be fully reflected. If the sample size was too large, although the reliability of this batch of products could be fully reflected, the test cost would be largely increased. With the increase of product samples, the user's risk decreased. The reliability of the packaged products was increased by integration of reliability theory into the vibration test of packaged products as well as the introduction of failure rate verification procedure and failure rate level into the test standards.