In this graduated thesis is given a project of a low pressure condensing steam turbine with two symmetric flows and a total of four subtraction's. Each steam flow has two subtraction's of steam. Based on the data, the effective turbine power of 93,8 MW, the speed of rotation 3000 min-1, the inlet steam temperature 289,40C and pressure of 7 bar, the pressure in the condenser 0,048 bar, two symmetric subtraction's at pressure 0,22 bar with a total mass flow of 6,124 kg/s, subtraction of steam on one flow with a pressure of 1,054 bar and a mass flow of 9,928 kg/s and steam subtraction at a pressure of 2,948 bar and a mass flow of 8,505 kg/s at the second flow, a thermodynamic caculation and a calculation of heat drop of a low pressure condensation steam turbine is completed. The calculation of heat drop yields the states of magnitude (pressure, temperature, enthalpy, specific volume) in certain characteristic points of the process in the turbine as well as mass flow of steam at the inlet of the turbine. Based on this, a thermodynamic calculation of turbine stages was performed, which provided the basic dimensions and current characteristics of individual turbine stages. Each flow has seven stages, and for each stage a thermodynamic calculation is separately made. In order to verify the result's of the current characteristics for each stage a velocity triangle is made. In the attachment you will find a scheme of the longitudinal section of the low pressure condensation steam turbine.