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The wave packet evolution of an atom irradiated by an intense laser pulse is systematically investigated by using the numerical solution of the time-dependent Schr(o)dinger equation. There are two types of spatial interference structures in the time-dependent evolution of the atomic wave packet. With the increasing of the evolution time, the interference fringe spacing for type Ⅰ (type Ⅱ) becomes larger (smaller). As the wavelength of the incident laser increases, the interference of the wave packet is changed from type Ⅱ to type Ⅰ, and the shift of interference type can be attributed to the contribution of excited states by using the energy analysis of the time-dependent wave function.