Deposition of collimated chromium (Cr) atomic beam focused by one-dimensional Gaussian standing-laser field with wavelength of 425.55 nm and powers of 3.93 mW and 40 mW is examined from particle-optics approach, using fourth-order Runge-Kutta algorithm with adaptive step size. The results show that the deposited structure has uniform periodicity along ox direction, while the structure quality has much difference along oy direction with different laser powers. When laser power is 3.93 mW, each nanoline is very clear, and the full width at half maximum (FWHM) is uniform in range of [-0.5, 0.5], where the unit is one laser waist radius, and the contrast is uniform in range of [-0.2, 0.2] along oy direction. When laser power is 40 mW, the nanostructure has three nano lines at the place where only one nanoline for 3.93 mW in range of [-1.08, 1.08] along oy direction. In addition, the structure in the plane of y=0 for 3.93 mW is similar to that in the plane of y=±1.08 for 40 mW, i.e. the average space is 212.78 nm, FWHM is 21.65 nm, and the contrast is 24.78. So the good deposited structure should correspond to suitable laser power.