Abstract: VOCs emission accounting is the basis of VOCs Pollution Prevention and control. At present,no relevant accounting guideline and specification has been issued in the field of coal chemical industry. Referring to "Guidelines for VOCs Pollution Source Investigation in Petrochemical Industry",in this paper,the VOCs emission source of a coal-to-olefin project in Northeast China was identified and cal-/formula and experience factor. The similarities and differences of accounting results between coal chemical industry and petrochemical industry were compared.The contribution rate of VOCs emission from different sources and the internal emission of sources were quantified and analyzed. The purpose of this paper is to provide theoretical and practical basis for VOCs emission accounting and source term analysis of modern coal chemical industry,and provide reference for the follow-up VOCs management and control. The results indicate that there/a. The contributions of VOCs emission sources in the coal-to-olefin project are listed as follows: wastewater collection and treatment 29. 46%,circulating cooling water 27.30%,tank 17.52%,equipment leak 16.66%,stationary combustion 5.53%,process vents 3.13%,loading0.39%. Compared with the traditional petrochemical industry and the coal chemical industry,the largest pollution source of the former is usually the storage tank,while the main pollution source of the latter is wastewater collection and treatment and circulating cooling water,in which the wastewater collection process accounts for 94.67% of the wastewater collection and treatment. Olefin separation unit and 2-PH unit are the main VOCs leakage devices,and one end of the open valve or pipeline is the main leakage sealing point. Methanol tank area is the key leakage area of tanks.Coal chemical enterprises should strengthen the closed control of the two key source items of wastewater collection and treatment and circulating cooling water,and set up waste gas collection and centralized treatment devices for targeted treatment of different characteristics of pollution.