The two-stage heat transformer (TSHT) is an advanced heat-transformer which can widen the operating range compared to that which can be achieved with a single-stage heattransformer (SSHT). This paper analyzes three kinds of two-stage heat transformers and puts forward the two-stage heat-transformer with H2O/LiBr for the first stage and 2,2,2-trifluoroethanol (TFE)/N-methyl-2-pyrrolidone (NMP) for the second stage. The results show that it can reach the same high delivered temperature as the two-stage heat-transformer with only TFE/NMP as working-fluid combinations and can achieve a higher system performance than the two-stage heat transformer with TFE/NMP.