In the thesis we discussed the characteristics and the process of obtaining the characteristics of an axial water turbine. We observed the power and the efficiency of the water turbine changing with the change of operating conditions. All the measurements were obtained on model testbed FM3SU with axial water turbine. During the experiment we measured water volume flow and water inlet pressure before turbine, rotational speed of the turbine wheel and the breaking force. Based on the measurements and calculations characteristics diagrams and hill chart of an axial turbine were designed. We found out that the power and the efficiency of the axial water turbine is higher, with the increase of the water volume flow; furthermore we concluded that the maximum efficiency was reached, when the turbine was burdened with the half of breaking load. Finally, with the analysis of the hill chart, we determined the optimal work conditions of the tested axial water turbine.