The detecting coverage is one of the important indexes of radar′s performance and of layout optimization of radar stations.Based on the basic equation of radar， the detecting coverage model of radar network applying different network forms and data fusion methods is derived.Then， visualization simulation analysis is carried out with Matlab.The simulation results show the usability of the model as well as the visualization method.The study has important theoretical significance and application value for the combat ability analysis of radar network and station layout optimization.