摘要： 国际投资协定中的公平公正待遇目前已成为最具争议性的条款之一。近年来，投资者以东道国违反公平公正待遇为由索赔的案件迅速增加，而且不少索赔案件得到仲裁庭的支持，从而置东道国于被动不利的境地。对此，缔约国可以通过在条约中对公平公正待遇加以定义，或对其适用范围加以限制，或对其适用的例外情况加以规定等方式，给公平公正待遇的解释和适用提供指南，限制仲裁庭在解释和适用公平公正待遇条款时的自由裁量权；或者将公平公正待遇排除在可仲裁事项之外。

关键词: 公平公正待遇 , 习惯国际法 , 投资争端仲裁 , 国际投资协定

Abstract: Fair and equitable treatment has become one of the most controversial clauses in international in—vestment agreements．Recently，the claims brought by foreign investors against host states in light of such clause are in—creasing rapidly．and the arbitrators have ruled in investor’s favor in some cases，thereby often leaving a host state in aunfavorable position．The Parties to the treaties may provide guidance to the explanation and application of the fair andequitable treatment clause and thus refrain the discretion of arbitrators by giving a definition to the fair and equitabletreatment．restricting the scope and coverage of the clause，or imposing certain exceptions on its application．Alternative—ly，a state may also preclude the matters concerning fair and equitable treatment from the scope of arbitration．

Key words: Fair and equitable treatment；Custom international law；Investor&mdash, state arbitration；International in&mdash, vestment agreement