The goal of my thesis is to verify the weak form of the efficiency of the exchange market. The paper results from the presumptions for efficient price movements on the financial markets. They are applied to the time series of exchange rates of five currency pairs. After definitions of testing methodology, the given exchange rates series are analysed with the help of correlation and autocorrelation test, runs test and a test based on technical analysis. The conclusion of the thesis anwers the question if the exchange rates movements are suitable with the efficient market hypothesis.