預防原則之效力範圍不僅及於環境保護而且及於人類及動植物 的健康保護等面向。本文一開始介紹國際環境文件及歐盟對於預防 原則的立場與看法，並且本文深入具體化預防原則的風險應用、發 動要件、採取措施，以及預防原則的適用指導方針（風險溝通、應 用性一般原則、舉證負擔之轉換）。尤其，預防原則的應用性一般 原則重要包括比例性原則、不偏頗原則、一致性原則、行動或不行 動之成本與收益審查、科學發展的審查。最後，面對環境保護、人 類及動植物的健康保護之潛在風險與科學不確定性，本文因此建議 「預防原則」有必要作爲環境保護以及人類及動植物的健康保護之 一般法律原則。

The effective scope of the precautionary principle extends beyond the sphere of environmental protection， also encompassing the human and animal health. This article at first introduces the standings and opinions of international environmental documents and the european union about the precautionary principle， and then the article continuously concretizes risk application 、the triggering factors 、taking of the measures and the guidelines for applying the precautionary principle (risk communication 、 the general principles of application 、the reversion of the burden of proof). In particular，the general principles of application of the precautionary principle importantly include the proportionality、 non-discrimination、 consistency、 examination of the benefits and costs of action and lack of action、 examination of scientific developments. Finally，in face of the Potential Risks and Scientific Uncertainty about the environmental protection and the healthy protection， the article therefore strongly proposes that the precautionary principle necessarily serves as the general principle in the sphere of environmental protection and the human and animal health.