Core Viewpoint - The article provides an overview of China's GDP accounting methods and preliminary results for the second quarter and first half of 2025, highlighting the importance of GDP as a key economic indicator and the methodologies used for its calculation [1][5]. Summary by Sections 1. GDP Accounting Overview - GDP is defined as the final result of production activities of all resident units in a country during a specific period, serving as a core indicator of national economic performance [5]. - There are three methods for GDP accounting: production method, income method, and expenditure method, each reflecting different aspects of economic activity [5]. 2. Accounting Scope - The production scope includes goods and services produced for other units, self-consumed goods, knowledge products for self-consumption, and housing services [6]. - The accounting subjects include all resident units within China's economic territory, excluding data from Hong Kong, Macau, and Taiwan [7]. 3. Accounting Frequency and Legal Basis - GDP is calculated quarterly, with a shift from cumulative to separate quarterly calculations starting from Q3 2015 [7][8]. - The accounting adheres to the Statistical Law of the People's Republic of China and follows the National Economic Accounting System [8]. 4. GDP Calculation Methods - The article details the classification system for GDP accounting, including the national economic industry classification and the three-sector classification [10]. - Various data sources are utilized for GDP calculation, including national statistical surveys and administrative records [11]. 5. Data Revision and Quality Assessment - The necessity for data revision is emphasized due to the preliminary nature of quarterly GDP estimates, which are later refined with more complete data [14]. - The quality of the underlying data and the methods used for GDP calculation are regularly evaluated to ensure accuracy and reliability [16][17]. 6. Data Publication - Preliminary GDP figures are typically released about 15 days after the end of the quarter, while final verified figures are published in January of the following year [19].