We present the timing and spectral properties of the transient X-ray pulsar GX 304-1 during its recent outburst in 2010 August , using observations carried out with the Proportional Counter Array ( PCA ) instrument on-board the Rossi X-ray Timing Explorer ( RXTE ) satellite . We detected strong intensity and energy dependent variations in the pulse profiles during the outburst . The pulse profile showed significant evolution over the outburst . It showed complex structures consisting of a main peak with steps on both sides during the start of the outburst . On some days , a sharp dip like feature was seen which disappeared at the end of the outburst ; when the profile evolved into a sinusoidal shape . At low energies , the pulse profiles appeared complex , consisting of multiple peaks and a narrow minimum . The amplitude of the second brightest peak in low energies decreased with energy , and above 12 keV , the shape of the pulse profile changed to a single broad peak with a dip like feature . The dip had energy dependence , both in phase and in width . We detected Quasi-periodic Oscillations ( QPO ) at 0.125 Hz with a harmonic . The QPO feature had a low rms value of 2.9 % and it showed a positive energy dependence up to 40 keV with the rms value increasing to 9 % at 40 keV . The QPO frequency decreased from 0.128 Hz to 0.108 Hz in 12 days . During most of the outburst , the 3-30 keV spectrum of GX 304-1 can be well fitted with a partial covering power-law model with a high energy cut-off and iron fluorescent line emission . For a few of the observations carried out during the decay of the outburst , the partial covering absorption component is found to change to single component absorption . We also found that the partial covering and high energy cut-off parameters vary significantly with the pulse phase .