依据自发参量下转换过程中泵浦光功率和相关光子的线性关系，搭建了光子计数器线性测量实验装置，分析了光子计数器非线性误差产生的机理，探讨其线性应用条件和修正方法.通过调节泵浦光功率改变入射至光子计数器的相关光子速率，实现了光子计数器线性的测量，并对实验测量值进行了修正.结果表明，通过线性测量和修正可以提高单光子计数器测量准确度，降低光子计数器的非线性误差，其入射光子速率最大线性工作范围可由105s－1扩大到107s－1.

Linear measurement device was set up based on the linear relationship between pump power and photons in spontaneous parametric down conversion process. The nonlinearity errors mechanism, linear condition and correction model of photon counting detector were analyzed. For the sake of realizing the linear measurement of the photon counting, the pump power was adjusted to change incident photon rate, and the experimental measurements were corrected. The results show that the measurement precision can be improved by measurement and correction. The maximum linear range rate of the incident photon could be expanded from 105/s to 107/s result from lower non-linear errors.