In order to effectively promote the green construction and solve the serious influence of foundation pit construction on environment, the evaluation method based on improved Vague similarity summary method is proposed. Firstly, the green construction evaluation index system is established from the aspect of target mechanism based on pressurestatusresponse (PSR) framework model, three principle and construction characteristics of foundation pit. And then the evaluation index empowerment is realized by COWA operator to weaken the negative impact of the expert; the similarity summary method of Vague cluster decision is improved; and the green construction level of the deep foundation pit is evaluated by concentrating Vague value of each index and subjective and objective weight of expert. Finally, the green construction index system and evaluation model are applied to Mong Kok Foundation Pit of Xiangjiang River in Qingdao; and the applicable results show the rationality and feasibility of the evaluation model.