Abstract: Based on human subjective perception, the acoustic environment quality evaluation in urban open space with dense population and dense traffic is studied in order to extract the "effective characteristic parameters" of acoustic environment evaluation from a large number of physical and psychoacoustic features, and expand the existing acoustic environment evaluation index. In this study, a sample set of "characteristic parameters"-"subjective satisfaction" is constructed based on the feature analysis of the overall acoustic environment of complex open space in Shanghai and the subjective evaluation experiment in laboratory. And then, the dual correlation coefficient evaluation method is proposed to quantitatively evaluate the internal mutual influence between 17 physical and psychoacoustic characteristic parameters and their influence on subjective acoustic perception, and screen out the "effective characteristic parameters" suitable for subjective evaluation of the overall urban acoustic environment, including equivalent continuous A sound level (L_A), the difference between median noise and ambient background noise level (L₅₀-L₉₀) and the sharpness (S). Among them, L_A is the decisive factor affecting the subjective satisfaction of acoustic environment, and its negative correlation with the satisfaction (Sat) reaches 88%, the negative correlation between L₅₀-L₉₀ and Sat is 25%, and the positive correlation between S and Sat is 33%. Based on the correlation coefficients, the weight coefficients of three "effective characteristic parameters" affecting the "subjective satisfaction" are further calculated as 0.6, 0.17 and 0.23.