The purpose of our book is to study the impact of financial crisis on Risk premium evolution. Our first chapter investigates the various contemporary financial crises and reviews the literature concerning financial markets' behavior in crisis times.In a second chapter, we will present our research's conceptual basis, the CAPM financial asset valuation model, with its conditional international version. A critical review of the literature will be conducted to identify the methodological limitations of previous studies, which seem to us to be limited insofar as they tested the CAPM either under the hypothesis of perfect integration or under strict segmentation.As for the third chapter of our work, its objective is to study international portfolio management's performance during financial crises.