Objective: To establish a correlation model between static refraction and the main refractive parameters  of children aged 3-12 years. Methods: This cross sectional study was divided into two parts. In part  one, in Changsha Aier Eye Hospital from July 2014 to June 2016, 245 children were randomly selected  and measurements were taken of their axial length (AL), corneal curvature (Km) and anterior chamber  depth, spherical equivalent refractive (SE) and calculated lens power (LP). The correlations between  refraction and the refractive parameters were analyzed to establisha correlative mathematical model. In part two, in Changsha Aier Eye Hospital from July to December 2016, 43 children were randomly  selected to measure the above refractive parameters and their cycloplegic refraction (SEmeasured). The lens  power and static refraction (SEcalculated) were calculated. The consistency between SEmeasured and SEcalculated was compared by Bland-Altman analysis. Results: The correlation model was established as follows:  The correlation coefficients between SE and AL, Km and LP were -0.95, -0.83 and -0.62, respectively  (all P<0.001). SE=110.56-2.51×AL-0.97×Km-0.44×LP (R2 =0.95, F=2534.52, P<0.001). There was a  significant correlation between SEmeasured and SEcalculated (r=0.97, P<0.001), the 95% limit of agreement was  -1.00-0.63 D, average error was -0.19 D (95% consistency limit: -0.28 to -0.10 D), and 81.40% of the  data points were within the clinically acceptable range (-0.55 to 0.55 D). Conclusions: The axial length is  the most important factor in refraction besides corneal curvature and lens power. The refraction correlation  model can accurately estimate the static refraction of children from 3 to 12 years old.