In order to ensure the reliability of transmitting datum on orbit

the change of space intersection angle of mapping camera is required in the scope of 5 seconds. In this paper

the calculation method is studied for the change of space intersection angle of mapping camera. First

the temperature field was calculated for high and low temperature operating condition with I-deas software. Then

the calculated temperature filed was input in structural model as temperature load. The temperature mapping was done from temperature model to structural model

namely

from simple model to complex model. The thermal-elastic deformation was calculated and the center of optical element deformation was got. Finally

the change of space intersection angle of mapping camera was calculated in two operating condition with self-programming software. The results show that the change of intersection angle is below when the temperature operating condition is changed. In a word

the calculated method can get the accurate change of intersection angle. The calculated data can benefit to the analysis on earth.