Abstract: This paper is based on existing theory of geomorpho-elimate unit hydrograph which is proposed by Rodriguez-Iturbe and Gupta et al. and suggestions are made for improvement.On the basis of the above improcment a model of geomorpho-elimate unit hydrograph for invariable travel time is proposed, which includes the unit hydrograph model of variable parameters.The model of geomorpho-climate unit hydrograph for variable travel time is proposed in this paper also, which includes both cases, one is known as detailed calculating model and the other simple calculating model.The various models proposed in this paper conforms both to reality and use convenience.A calculating example of geomorpho-climatic unit hydrograph is Proposed in this paper.These calculating models are both useful and satisfactory in their ccuracy in design and prediction.