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国际地圈－生物圈计划（ＩＧＢＰ）是当前地学领域最重要的科学活动之一，其核心项目“古全球变化（ＰＡＧＥＳ）”的主要目标是研究过去的全球变化问题。而ＰＡＮＡＳＨ计划（南北半球古气候计划）是当前ＰＡＧＥＳ活动的焦点。其主要目标是通过三个ＰＥＰ（极地—赤道—极地）大断面，建立气候变化的序列和相位关系。文章对ＰＡＮＡＳＨ及其三个ＰＥＰ项目的主要科学目标和科学问题进行介绍，并对它们共同的科学问题进行分析。我国是ＰＥＰ－Ⅱ断面的重要组成部分，在该方面研究的程度直接关系到整个ＰＥＰ－Ⅱ的工作。组织好该方面的研究是我们重要的国际科学责任和义务。
The International Geosphere-Biosphere Program (IGBP) is one of the most important scientific activities in the current geoscience field. Its core project, “Ancient Global Change (PAGES)”, has the main objective of studying past global changes. The PANASH program (ancient northern and southern hemisphere climate plan) is the focus of the current PAGES activities. Its main goal is to establish the sequence and phase relationship of climate change through three large sections of PEP (Polar-Equatorial-Polar). The article introduces the main scientific goals and scientific issues of PANASH and its three PEP projects and analyzes their common scientific problems. Our country is an important part of PEP-Ⅱ section, and the degree of research in this area is directly related to the work of the entire PEP-Ⅱ. Organizing research in this area is our important international scientific responsibility and obligation.