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The conditions that the droplet's thermodynamic parameters change with time have been calculated, and the contrast between them when different laser pulse patterns are selected have been analyzed accordingly. The results show that: Two atomization processes are formed, and the second one is not evident for the case of gaussian distribution laser pulse. The change trend of the time-related expansion velocity is first increased, then decreased for the case of flat top distribution laser pulse, and is first increased, then maintained for the case of gaussian distribution laser pulse. The expansion process displays a stable stage in which the expansion velocity fluctuates slightly after atomization for the case of gaussian distribution laser pulse. In the terminal phase of the laser pulse, negative expansion acceleration appears for the case of flat top distribution laser pulse. The time-related temperature variations are more complicated for the case of flat top distribution laser pulse.