We studied the intensity distribution of single soliton at the focal plane in tight focusing system. The soliton is an analytical solution of differential nonlinear Schrdinger equation (DNLSE) with non-vanishing boundary condition. Bright and dark solitons are considered for different soliton parameters and different numerical apertures of the tight focusing system. The simulation result shows that the focusing property of dark soliton has a good periodicity with the soliton parameter, the bright soliton has a better focusing property than the dark soliton, and the focal spot of the soliton will shift by changing the soliton parameter, which provides a possible application in optical guiding.