A testing system includes a testing device configured to test product characteristics of a first sample by sampling the first sample from a population; a main storage device configured to store analysis information and testing information, the testing information includes a confidence interval tolerance of the first sample; an analysis module configured to analyze at least one of statistical data and a confidence interval of a mean value of the population, based on the analysis information; and a calculation module configured to calculate a first sampling number of the first sample, based on results of the analysis module.