In order to realize the focusing function of the dielectric metasurface and the adjustment of the phase of the light field, the geometric phase modulation principle was used to design the micro-element structure and spatial distribution. Using SiO2 as the substrate and the hexagonal unit cell of sub-wavelength TiO2 elliptical cylinder as the basic structure, a metalens with a parabolic gradient distribution of phase mutation was designed, which was suitable for the wavelength range of 480nm to 580nm. Based on this structure, theoretical analysis and experimental verification were carried out. It is found that for the linearly polarized light with this structure, the normalized full width at half maximum of the focus is about 428nm, and the full width at half maximum obtained by focusing on vector light is about 258nm, which is better than that of the linearly polarized light. The focusing characteristics of the 3rd-order and 4th-order Ince-Gaussian vector light field after passing through the metasurface were studied, and the basic spatial structure of the focusing field can maintain the incident vector light field, but the center structure information will be lost. That is, the Ince-Gaussian vector vortex light field will show a broken spatial structure after focusing due to the existence of the vortex phase. The results show that the matching degree between the metasurface structure and the incident light field vector structure is an important factor affecting the focusing characteristics. This research provides a reference for understanding the metasurface focusing mechanism of complex vector light fields.