The simulation program has been implemented to simulate the procedure of hxmt detecting x - ray source . the simulation result has been used to analyze the overlay region in celestial sphere , the variation of photon current intensity and the variation of the angle between sun and orbit , which demonstrate the reason why to select a 550 km height and 43o inclination low earth orbit as hxmt ' s orbit 利用仿真程序,實現(xiàn)了仿真一個正在預研的天文衛(wèi)星? ?硬x射線調(diào)制望遠鏡hxmt觀測x射線源的過程,分析了天球覆蓋、 hxmt接收的光子流強度的變化和太陽軌道面夾角的變化,說明了選取高度為550km ,傾角43o的近地圓軌道作為hxmt的運行軌道是合理的選擇。