Abstract: It was shown by previous researches that the system of ammoniawaterlithium bromide absorption refrigerator, without solution heat exchanger and solution pump had a better thermal performance, a lower initial investment and a higher safety, compared with the previous patterns. For further improvement of the system, three novel systems with solution heat exchanger were proposed and designed. The experiments were also performed for these novel systems. When wNH3=50%, wLiBr=15%, the coefficient of the performance (COP) of systemⅠwas improved by 27.8%, and that of systemⅡwas improved by 65%, compared with the system without solution heat exchanger. By means of the solution heat exchanger, the COP was increased greatly. Finally, the defects of systemⅡwere discussed and further improved systemⅢ was presented.