Abstract: The scheme design is the very initial stage of the architectural design, which acts as a key role in achieving the expected comprehensive objectives of the project. For the green buildings, the scheme design will focus more on the environmental performance, considering many design factors. So, the task is a typical multi-objective and multi-attribute decision-making job. Based on the parametric design theory, this paper analyzes and extracts the key design factors affecting environmental performance during the scheme design phase, and then establishes a design optimization model with energy consumption and natural daylight as the objective functions. Through integrating the NSGA-Ⅱ algorithm and GBS simulation by using Dynamo, the model can be solved, and the optimal design scheme will be selected. Lastly, a case study is conducted to verify the validity.