Using the data of the Lightning Location System (LLS) over Hubei Province, through the analysis of the distribution characteristics of CG (CloudtoGround) flash Location in 2015, it is found that the layout of the detection station has influence on the spatial distribution of lightning. Using the grid CG flash density data to characterize the spatial distribution of the CG flashes and the station distance factor to characterize the detection station layout, the study shows that there exists negative correlation between density and factor, significant correlation between the density of the component and the factor for the lightning current amplitude of 5 to 30 kA, and insignificant correlation for the >30 kA the density of the component. So it is necessary to revise the density to eliminate the influence of the station layout. In this paper, the relative detection efficiency is defined as the ratio of the densities before and after the revision in percentage, setting the station distance factor as the minimum value that corresponds to the grid relative detection efficiency of 100%. On the basis of the theory of the linear regression method and its residual, the revision model of the grid CG flash density and the statistical model of relative detection efficiency are established. The consistency of the results of the density segment and the nonsegmented revision is verified. Through the contrastive analysis of the theoretical detection efficiency and relative detection efficiency, the revision and statistical methods and the feasibility of relative detection efficiency are also verified.