The spatial heat flux calculation of a satellite is the basis of its visible and infrared feature analysis.Firstly,the spatial heat flux calculation models based on Monte-Carlo method are established.Secondly,the spatial heat flux of a three-axis stabilized satellite in the sun-synchronous orbit is calculated in one circle.Finally,the calculation results of spatial heat flux are analyzed in detail.The research results have reference value for the visible and infrared feature analysis of spatial targets.