The parametric study of thermodynamic performance on gas power plant. The variation of operating conditions, exhaust temperature. Gas turbine inlet air cooling has been considered for the power output and efficiency of gas turbine during hot seasons. In this research, the power requirements of several inlet air cooling techniques for gas turbine power plant. The considered techniques are evaporative cooling and chiller coils system for decrease the inlet air temperature to the compressor. The results show that the inlet air temperature, compressor ratio, inlet gas turbine temperature are.