Abstract: Objective: To evaluate the clinical value and the effects of the accommodation factors on the measured results with computerized refraction for checking the refractory errors in youth and children.Methods: Investigation was carried out on the relationship between pre-and post-paralysis accommodation with computerized refraction in 190 eyes of 5-26 years old patients, by self control analysis. Results: Before and after regular paralysis, both the differences of the spherical and cylindrical mirror values were different significantly （P＜0.05） in patients under twenty, but they were not significantly. Different in patients above 20. The mean difference of axial of cylindrical mirror was less than 5°,it was not statistically different （P＞0.05）.Conclusion: The youth under twenty should be emphasised to refract with computer after paralysis accommodation and the axial of the cylindrical mirror may take as the basis to definite the axis.