The total design scheme of an electronic shelter is introduced. Based on the analysis of thermalsources in the shelter, the problem about thermal radiation and their solutions are presented. Based on Icepak soft.ware, a model of thermal environment in the shelter is simulated to analyze whether the heat dissipation require.ments of electronic devices can be met. And thermal comfortable feeling of operators in the shelter is considered,too. The simulation calculation indicates that the system thermal simulation work based on Icepak software has bet.ter theory support and guidance effect on total structure design.