Bifocal lens is an important optical component. In response to its miniaturization and lightweight requirements, combined with the fine control capabilities of metalens for light fields, a proportion of focusing intensity controllable bifocal lens based on spatial multiplexing is proposed. Firstly, as a sub-metalens of bifocal metalens, the design principle of off-axis metalens is analyzed. Then, two types of metalen coupling methods, the splicing method and the spatial multiplexing method, are compared and analyzed. The results show that the spatial multiplexing method can better restore the performance of the sub-metalens. Finally, based on the idea that control focusing intensity by adjusting the number of microstructures, bifocal metalens design with intensity ratios of 1∶2 and 3∶2 is realized, which verifies the effectiveness of focusing intensity control.