This work concern about two tasks related to the working and performance of space vector pulse width modulation; understanding the principle of space vector modulation and investigating the harmonic performance of the two-level voltage source inverter. Space Vector Pulse Width Modulation (SVPWM) is basically a modulation technique based on modulation of input dc signal (constant value) into output pulses of different width and different, usually 5 or 7, amplitude levels thus generating an AC signal which could be smooth out by proper filtering or selecting a proper inductive load. Space vector modulation scheme is superior to Pulse Width Modulation (PWM) scheme because there are two main problems in PWM, harmonic distortion and switching speed, and both of these problems are overcome by implementation of the SpaceVector PWM (SVPWM) technique. Two level inverters are investigated by means of their harmonic distortion. This proposed work introduces an improved version of space vector modulation by using a modified two level voltage source inverter for eliminating the even-order harmonics.