Abstract: The working principle of Synthetic Aperture Radar (SAR) based on the knolledge of the relative motion between the vehicle (strictly is Antenna Phase Center)and the target. If the flight path of the vehicle is not accurately known or the SARprocessor is limited in its ability to take the flight data into account, the SAR imagewill be degraded. The purpose of this paper is to study the stripmap SAR MotionCompensation (SARMC) requirement to complicated Line-of-Sight (LOS) motionerrors of flight vehicle and to derive analytical equations of SARMC quantitativerequirement expressed as allowable maximum value of the mainlobe shift, quadraticphase error, cubic phase error and the Integrated Sidelobe Ratio (ISLR).