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In light of infrared theodolite network training and real background training, an actual equipment and background training emulation system for infrared theodolite is studied. System can ensure the original functions of equipment , add the functions of IP multicast and image transmission between equipment and training center. In training, background is transformed from real background gray image which infrared camera outputs. The trajectory data of targets is generated by the local computer or multicast received from training center. DirectX 3D is used in the target image simulation. The fusion of simulated targets and real background is determined by the error of trajectory data and theodolite tracking position. Real time data and image can be saved by system or training center, which is used to evaluate and replay. Application proves that the system can simulate the actual combat training to operators and improve their operating equipment proficiency. Relevant technology of this system has reference value for the study of real practical training system to the other type optical equipment in range.