Link-16 data link is a widely used tactical communication system, which is characterized by good confidentiality, high transmission rate and strong anti-jamming ability.Link-16 incorporates variety of anti-jamming techniques including CRC, RS encoding, interleaving, CCSK spread spectrum, MSK modulation, high-speed frequency hopping, and dual-pulse structure, These technologies enable the system to achieve effective interference suppression in both time domain and frequency domain. To address problem when DOA of the desired signal cannot be obtained, the improved power inversion algorithm(PI) is presented. To tackle the problem of the attenuation in the desired direction during high SNR and insufficient interference suppression during low ISR, a matrix reordering-based power inversion algorithm (MRPI) is proposed. The MRPI algorithm employs a diagonal loading technique based generalized linear combination to correct the covariance matrix, then, the covariance matrix is decomposed by eigenvalue decomposition, and the eigenvectors corresponding to interference are discarded to mitigate the impact of interference components on the optimal weights, achieving strong interference suppression in the presence of weak interference.The effectiveness of the MRPI algorithm is verified through simulations by comparing the nulling variations of the desired and interference signal directions in the beam pattern. Additionally, the improvement of the system's anti-interference performance is validated by comparing the output SINR against the input SNR.