Green two-star building refers to a building that meets the two-star evaluation standard of green building (GB/T50378-2006). It is necessary to achieve six indicators: land saving and outdoor environment, energy saving and energy utilization, water saving and water resources utilization, material saving and material resources utilization, indoor environmental quality and operation management. Green two-star building refers to a building that meets the two-star evaluation standard of green building (GB/T50378-2006). To achieve the six indicators of land saving and outdoor environment, energy saving and energy utilization, water saving and water resources utilization, material saving and material resources utilization, indoor environment quality and operation management, it is divided into three stars, two stars and one star from high to low. According to the regulations, new and civil construction projects in the project proposal, feasibility study or preliminary design stage within the city should meet the following conditions and implement the two-star and above standards for green buildings: public welfare buildings with a construction area of more than 5,000 square meters invested or mainly invested by the government mainly include schools, hospitals, libraries, museums, science and technology museums, gymnasiums, community service centers and social welfare facilities. Large public buildings with a single building area of more than 20,000 square meters mainly include airports, stations, hotels, restaurants, shopping malls and office buildings. All civil construction projects in the project proposal, feasibility study or preliminary design stage in the green ecological city area shall implement green building standards, and the standard green building area of two-star and above shall not be less than 250,000 square meters.