The current status of optical phased array lidar antenna technology at home and abroad was introduced， its basic principle and system composition expounded， and the technical scheme of cascaded silicon-based optical phased array lidar antenna was analyzed.On this basis， key technologies such as high-density low-crosstalk waveguide array technology and stacked optical phased array technology were tackled， the key technical parameters of the lidar system were obtained， and the technical problems to be solved were furtherly elaborated.At last，the application expectation of lidar was discussed.