This article clarified the quantitative relationship between the three attributes of urban building colors and the comfort of visual recognition under the haze weather to clarify the comfortably recognition threshold values of three color-appearance attributes of urban building in the hazy weather. The quantitative index could be provided to designers to choose architectural colors that effectively identify building color in both normal and abnormal weather conditions

while offering referential research methods for urban environmental color planning and evaluation in the abnormal weather. Firstly

the research experiments are based on the practical and fixed-point measurement of the three color-appearance attributes of building colors in Harbin

one of the most heavily polluted cities. The types of selected buildings are commercial and residential buildings

which make up the largest proportion of buildings in Harbin

and the research scope of haze index will be determined through experiment. Secondly

126 color samples in total that selected by orthogonal method were evaluated on 30 subjects based on Likert scale in the laboratory. Finally

by using R language Statistics analysis

the distribution region and the changing threshold value of color attributes including hue

chroma and value could be related to the visual comfortable level of subjects. The results indicated that the values of the three color-appearance attributes of buildings could all directly affect the visual comfort level. Among those three attributes

value has the greatest influence

followed by chroma

and finally hue. Further the warm colors were more comfortable than cool color in the haze weather.