## 1 Introduction  
The rapid development of the construction industry has led to high energy consumption and greenhouse gas emissions. According to statistics from the International Energy Agency, the construction industry accounts for 37% of global carbon emissions, and has become one of the key carbon reduction areas [1]. The relevant research is mainly concentrated in developed countries and building carbon emissions in developing countries are gradually gaining more attention. According to [PERSON]'s statistical research, China has the most published literature on building carbon emissions [2]. As a rapidly growing developing country, China's energy conservation and emission reduction path will provide ideas for many developing countries in the world [1]. In order to promote building environmental impact assessment more broadly, it is important to establish a building carbon emission database and related standards classified by regions and types of building [3, 4]. Referring to relevant research results, the general level of building whole life cycle carbon emissions can be estimated. [PERSON] compiled data for 104 calculation cases; the whole life cycle energy consumption of residential buildings was mainly in the range of 40-400 kWh/(m\({}^{2}\) a) [5], and the public buildings were in the range of 120-550 kWh/((m\({}^{2}\)a). [PERSON]'s study collected and compiled 348 casesof building carbon emission calculations [6], and most of them had carbon emissions in the range of 0.25-0.6 tCO\({}_{2}\)e/m\({}^{2}\) for the production phase of building materials. In this paper, 18 calculation cases in China were selected for statistics. The whole life cycle carbon emission is in the range of 2-5 tCO\({}_{2}\)e/m\({}^{2}\). The materialization phase is generally in the range of 0.3-0.8 tCO\({}_{2}\)e/m\({}^{2}\), accounting for 10-30% of the whole life cycle carbon emission. The operation phase is generally in the range of 2-4.5 tCO\({}_{2}\)e/m\({}^{2}\), accounting for 75-90% of the whole life cycle carbon emission [6; 7; 8; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18; 19; 20; 21; 22; 23]. The calculation of building carbon emissions is an important basis for the development of zero carbon buildings. The most common method of carbon emission assessment for single buildings is the life cycle assessment (LCA) [5]. The whole life cycle of a building generally refers to the whole process from the production of building materials to building demolition and disposal. The sum total of greenhouse gas emissions from energy consumption during the materials production, transportation, construction, operation, and disposal phases are known as life cycle carbon emissions. Key steps of life cycle assessment methodology include the identification of goals and scope, inventory analysis, impact assessment, and interpretation of results [24]. The calculation methods for a single buildings' carbon emission assessment have been developed gradually. The existing research mainly focuses on the calculation framework and boundary, calculation tools and the source of uncertainty in the calculation process. However, whole life cycle carbon emission is often needed to be known at an early stage of the building design to obtain more energy-efficient design solutions. [PERSON] pointed out in a literature review that few studies are focusing on carbon emissions calculations in the absence of actual documented data and other information, and that there are great challenges in the selection of data collection processes [25]. The difficulties are as follows. First, life cycle assessments are mostly based on the assumed stable state. However, the users' behavior, energy consumption, and external environment are in the process of dynamic change and reliable dynamic assessment methods are still lacking. Second, the data resource varies from different life cycle stages, the data sources and computational boundary selection rules are inconsistent among different cases.