To deeply comprehend the environmental impact factors of the Tainan Technology Industrial Park on southern Taiwan, a multi-objective decision support method is developed and the factors based on six categories are considered. Firstly, the Delphi method is adopted to acquire the opinions of experts. The questionnaire is designed to facilitate sound decision-making by using both empirical data and subjective judgment. Secondly, according to the reply answer of questions to establish the hierarchy diagram and factor assessment by the AHP (analytic hierarchy process) method. The pairwise comparisons are carried out to quantify the assessment factors and establish the priorities. Thirdly, the consistency index is calculated and evaluates the contribution to objectives based on the weighting values of impact factors. During the construction and development of Tainan Technology Industrial Park, there are eight important impact factors. Once the project is finished, there are seven major impact factors. Based on the priority of these factors, it can be a guideline on the environment protection of land development.
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