Abstract: The paper proposed a noise evaluation model，NEM，aiming at large-scale area． The discrepancy caused by the noise in exposed crowds and varieties of noise environmental function areas was considered comprehensively and was made a hierarchical representation according to environmental quality standard for noise in city and the impact on people’s health by noise in the NEM model． Furthermore，in case study，an evaluation of Guangzhou’s noise condition was presented using NEM model． Contrasted with NPI method and NII method，the comparison of evaluation results indicated that to evaluate noise in environmental large-scale area the NEM model is scientific and reasonable，and reliable to get the conclusion．