提出基于平顶复合光脉冲构建大动量原子干涉仪的方案。利用大动量原子干涉仪灵敏度函数解析模型，对大动量原子干涉仪的对比度和相位噪声进行分析。将平顶复合光脉冲应用于原子干涉仪进行仿真计算，结果表明平顶光相比高斯光可提高原子团跃迁的一致性，增加原子干涉条纹的对比度。通过设计对称反向的复合脉冲序列，抑制多脉冲作用过程中相位噪声和振动噪声的干扰。数值仿真结果表明，相比高斯光脉冲，使用平顶复合光脉冲的大动量原子干涉仪的灵敏度提高了1个量级，同时具有较好的抑制环境噪声的能力。

Herein, we propose a scheme for developing a large-momentum-transfer atom interferometer based on the top-hat composite light pulse technique. Additionally, we analyze the contrast and phase noise using a theoretical model of the sensitivity function of the proposed atom interferometer. A top-hat composite light pulse is used to simulate calculations based on the atom interferometer. We confirm that compared with a Gaussian beam, a top-hat composite light pulse can improve the consistency of atom cloud transitions and increase the contrast of atom interference fringes. By designing symmetrical and reversed composite pulse sequences, the phase noise and vibration noise in the time interval and free evolution process of multipulse action can be suppressed. The numerical simulation results show that the sensitivity of the proposed atom interferometer using a top-hat composite light pulse increases by one order of magnitude compared with that using a Gaussian beam. Moreover, the proposed atom interferometer achieves satisfactory suppression of external technical noise.