“…Baer (1997) offered a comprehensive comment on the theory of planning quality assessment and provided the overall guidelines for these evaluations (He et al, 2011). Based on the theoretical basis of Baer (1997) and Berke et al (2006), Berke and Godschalk (2009), several studies (Berke, et al, 2012;Horney et al, 2017;Lyles et al, 2014) complemented the principles of plan evaluation as following: goals, fact base, policies, participation, coordination, implementation, and monitoring (Feinberg & Ryan, 2022).1) an internal effectiveness evaluation-evaluating the integrity and logic of the planning content, including information base and problem identification, planning vision and goals, and policies or strategies; 2) an external effectiveness evaluation-the evaluation of the consistency and coordination between "vertical-level" and "parallel-level" plans, including planning coordination, institutional coordination and public participation (Song et al, 2017;He et al, 2019). With reference to the Urban Underground Space Planning Standard and relevant research, we established a sustainability evaluation framework of designated underground space plan (Figure 1; Supplementary Table S2).…”