介绍了用一种结构简单、易于操作的浓度法测定保鲜膜透气性的装置及其测定原理和方法，并提出了一种采用浓度法测定保鲜膜透气性时，对取样带来的误差进行校正的方法。测试过程中，取样会引起样品室内气体总压力和样品气体含量的下降，从而给测定结果带来误差，校正时需要在取样前后分别测定样品室内气体的总压力。

The simply constructed and easy operated device for measuring gas permeability of preservative film with concentration method was introduced together with its principle and method. A correction method of the measuring error coursed by sampling was put forward. It was put forward that during the measurement of gas permeability, gas sampling leads to pressure descent and loss of sample gas in the sample chamber, which brings to error of the determination result; to correct the error, total pressure in the sample chamber must be measured before and after every sampling.