The effects of laser field and laser pulse width on the dissociation probability of C-H bond of CH4 have been investigated. Calculation of time dependent Schrodinger equation by grid spectral method is carried out and it is produced optimistic results in comparison to the earlier Quasi-classical calculations. The results show that there is an excellent match with experimental data. In this work, a number of results in the emerging field of laser with intensity of I = 8 x 10(13) W cm (2) and pulse duration of 100 fs are presented. The present modulated field leads to more than 20% improvement in the dissociation probability. (C) 2012 Elsevier B.V. All rights reserved.