The wavelengths, radiative transition probabilities and autoionization rates have been calculated for the transitions 1s2l3l'-1s² 2l in a wide range of nuclear charge Z. These data were used for the calculation of relative intensity factors Q_d for dielectronic satellite of highly charged He-like ions. Synthetic spectra will be built from these data for different plasma sources. A perturbation theory method is described for the calculation of atomic properties of autoionization states. Correlation, relativistic and radiative effects were taken into account. Z-dependencies of radiative transition probabilities and autoionization rates are discussed. Relative intensity factors of dielectronic satellite lines are shown as functions of Z for different types of 1s2l3l'-1s² 2l transitions.