This work presents measurements of temperature and density of a plasma as function of pressure. The plasma was produced by a pulsed discharge used to obtain TiN coatings. The system is composed by a chamber, which is filled with nitrogen at pressures that vary between 0.2 to 3.0 mb. Optical emission spectra were taken in different regions, and then, twenty lines were used to calculate the temperature using the relation line ‐line method. Moreover, the method of relation between lines of same species and consecutive ionization state is utilized to calculate the density of the plasma.