Cross radiation is an important part of atmospheric effect in remote sensing data The analysis of its effect in a slant viewing angle is significant

especially to the multi-angle remote sensing which obtain surface data through several scan angles This is also the domain rarely mentioned in the existing atmospheric correction models Atmospheric cross radiation effect can be described by the point spread function（PSF）

whereas by the modulation transfer function（MTF）in the frequency domain We can specify and correct that effect by analysing those two functions In our research

we discover that the cross radiation is related not only to the atmospheric optical depth and image resolution

but also to the scan angle This paper provides its analytical expression and concludes some regularities