The condition for introduction of the euro, according to the Maastricht convergence criteria, is at least two years participation in the exchange rate mechanism ERM II (exchange rate stability criterion). The participation in ERM II is compatible with certain exchange rate regimes only. The aim of this paper is to find arguments for choosing one of these regimes. The starting point is the current strategy of introduction of the euro in the Czech Republic, expressing concern about the fixing of the exchange rate. Experiences with exchange rate regimes applied with participation in ERM II by the new Member States of the euro area are being evaluated. The fixing of the exchange rate in the regime peg with a band of oscillation of 15% in both directions is the working hypothesis. Criteria of the so-called normal fluctuations margins and so-called severe tension, i.e. developments in foreign exchange reserves and interest rates, are being discussed. The outcome of the research is finding of risks associated with this exchange rate regime.