For the influence of operating temperature on detection range of InSb photovoltaic detection system,the relation between operating temperature and D* was obtained based on carrier transport in detector and Johnson noise,and the detection range model of the system was built under temperature variation.On the basis of this model,the variation curves between detection range and temperature are gotten through simulation experiment,and the influence of detection range on operating temperature is analyzed.To validate the veracity of this model,the experiments of detection range under different temperatures are carried out,and the experimental results are compared with the simulation results,and then the error is analyzed.These results show that this model is suitable for the actual situation,which has an important significance for improving system operating environment and application.