Effectively evaluating the technical and operational measures that ports could adopt to reduce greenhouse gas (GHG) emissions is important for port operators, because different measures have difference in their GHG reduction performance, economic efficiency, operational efficiency, etc. This chapter proposes a generally conceptual evaluation framework for ports’ technical and operational measures to reduce GHG emissions. Five main indicators are proposed and discussed based on the existing literature, namely the capacity to reduce GHG emissions, operational efficiency, economic efficiency, technical maturity, and comprehensive transferability. Specifically, the capacity to reduce GHG emissions is directly related to how many emissions can be reduced; operational efficiency focuses on the productivity performance; economic efficiency aims at achieving more emission reductions with lower economic costs; technical maturity bears on the industrialization and practicality level; comprehensive transferability means the GHG reduction measures’ promotion and diffusion across different regions and port operation scenarios. The proposed evaluation framework can help port operators and authorities to identify and choose the technologies that are suitable for their ports with potential application.