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In this paper, a new amplitude quantization synthesis method for ultralow sidelobe phased arrays is propose, which is based on the constrained nonlinear optimization algorithm. By introducing a set of critical constraint conditior into the optimization model, we can directly quantize the amplitude distribution instead of replacing it with a continuous equivalent aperture antenna. The mutual coupling and the element patterns are also considered in the quantization synthesis. Finally, some array simulation results are given to show the effectiveness of the method.