The Caspian Sea is well covered by TOPEX/Poseidon, Jason-1, GFO and ENVISAT satellite altimeters. Having a prolongation opportunity for the TOPEX/Poseidon data on the Caspian Sea level with data from Jason-1 along the same tracks, we constructed new time series of TOPEX/Poseidon extended by Jason-1. Average bias of common period for each TOPEX/Poseidon track extended by Jason-1 has been calculated. Time series of Jason-1 and ENVISAT have been also constructed and the average bias for their common period has been calculated. The average bias of common period for TOPEX/Poseidon and GFO has been also calculated. The average bias values have been applied to compute the variation of the Caspian Sea level in the multisatellite mode (from 1993 to present). Amplitude of the Caspian Sea level variations calculated along the TOPEX/Poseidon and Jason-1 tracks has been also studied. Maps with the amplitude of annual signal along tracks, and a map with an interpolation of the amplitude all over the Caspian Sea were constructed.