Abstract: To design suitable tunnel and unit arrangement layouts for pumped storage power station based on their characteristics, taking Qingtian Pumped Storage Power Station in Zhejiang Province as an example, a comparison was made between the two-tunnel-four-unit scheme and the one-tunnel-two-penstock-four-unit scheme in terms of hydraulic conditions, operational management, functional performance, construction conditions, project scale, and investment. The results indicated that compared with the two-tunnel-four-unit scheme, the one-tunnel-two-penstock-four-unit scheme could save the cost, but it had problems such as poor operational flexibility, increased hydraulic interference, and reduced feasibility for black-start capability. Therefore, the two-tunnel-four-unit arrangement was adopted for Qingtian Pumped Storage Power Station. The findings can provide a reference for research on tunnel and unit combination in similar pumped storage power stations with medium-to-high heads and long diversion systems.