The bucket model of the bearing mechanism of the construction group was established considering the short-board effect of the pollutant discharge factors in the construction process, for the purpose of seeking the optimal combination system of "green construction-resource- environment-construction activity intensity". This model was based on the multi-dimensional benefits under ideal bearing state, taking the construction group as the research subject. According to the principle of state space method, the bucket bottom, bucket wall and bucket water were taken as the status axis, the bearing status was taken as main body and the state of the bearing capacity of the construction group was modeled. Combining the construction of deep cutting and expert decision-making opinions, thirty-one variables were selected as bearing and pressure indexes. With the Canopy platform, the random forest (RF) algorithm and the short board factor measurement model were used to assign weights, and the comprehensive carrying status of the construction group was determined. Taking the deep cutting of Lanxin high-speed railway as an example, a bucket model considering the short-board effect was constructed, the state of the construction group was determined based on the state space model. And it is believed that the green construction effect is positively correlated with the bearing state of the construction group; the comparison of the radar chart in the previous research confirms the feasibility of the proposed model and method.