Abstract: The design and operating principle of a double-effect liquid desiccant dehumidifier driven by hybrid solar- trough/gas-boiler are presented，where the weak desiccant is concentrated by boiling and non-boiling evaporation. Then a stable heat and mass transfer mathematical model for the packed-type dehumidifier is developed by the lumped parameter method and a comparative analysis of its regenerating performance under two different inlet conditions is conducted. The regenerating performance under the inlet condition of adopting cold air to condense the high-temperature weak solution is better than that of adopting hot air to condense the low-temperature weak solution，which provides a basis for the hybrid dehumidifying process design. The double-effect regeneration method can guarantee the system a stable operation，increase the concentration of regeneration solution and improve the energy efficiency.