Carrier phase dependent characteristics of a few cycle chirp free Guassian pulse have been studied in the time domain. Expressions of the pulse energy W, center of gravity of the time 〈t〉, and effective pulse width τ eff have been deduced in terms of the carrier phase. Results suggest that the carrier phase takes effect when the time width (FWHM) τ P of the pulse envelope becomes smaller than the period of the carrier oscillation period.