Abstract: Uncertainty visualization methods for multi-scale representation of spatial data were studied based on visual and cognitive. These methods included the model of graded representation, the mapping relations between colors and the uncertainty, visual variables system of uncertainty visualization. Besides these, another method of uncertainty visualization by the dynamic and dynamic symbol was proposed . Experimental studies showed that these methods could represent the uncertainty of spatial data clearly, directly and effectively, and could promote to comprehend the change and the propagation law of uncertainty.