Abstract: The successful separation of the Electromagnetic-Separation-Electric-Connector(ESEC) is an important prerequisite for the satellite-rocket separation. In this paper, some microsatellite is considered, whose ESEC has two kinds of separation modes: electric separation and mechanical separation. The separation time sequences in the normal and the abnormal separation modes are analyzed. Two mechanical models in the two separation modes are established. The interference with the satellite separation attitude by the mechanical separation force of the ESEC is simulated. The satellite separation attitude in the abnormal mode is compared with that in the normal mode.