Atmospheric transmittance in typical regions of China was calculated. The average absolute deviation of the results of transmittance calculated with approximate foreign atmospheric model was investigated. The results showed that the average absolute deviations calculated using approximate foreign atmospheric model were larger. For example, the average absolute deviations calculated in coastal and mainland regions of China using 1976 USA atmospheric model can reach to 0.40 and 0.22. The average absolute deviations calculated in coastal and mainland regions of China using midsummer atmospheric model can reach to 0.31 and 0.29. The average absolute deviations calculated in Northwest and coastal regions of China using midwinter atmospheric model can reach to 0.1 and 0.36. These results also illustrate that the atmospheric models of China must be considered for the better estimations of the atmosphere transmittances.