LiBr, LiNO3 and NaOH are three widely used additions that can significantly improve the performance of ammonia absorption heat pump cycle. To compare the enhancements of using different additions, Aspen plus process monitor is applied to simulate the performance of ternary NH3-H2O-salt absorption heat pump. The results indicate LiBr heighten the performance most, 16.52% higher than ternary cycle. However, the existence of additions has an adverse effect on absorption process because it decreases the absorption capacity of the ternary working fluid. To avoid the negative effect, electrodialysis technique is employed to separate additions from absorber to generator. The new models of NH3-H2O-salt absorption heat pump combined with electrodialysis device are established and simulated in Aspen plus process monitor. The results show that, LiBr can increase the COP of new absorption heat pump cycle up to 12.36%, highest in the three additions compared with traditional cycle.