To address the problems of poor adaptability and weak security in the encryption of remote sensing images,this paper proposes a multi-band remote sensing image encryption algorithm based on a novel two-dimensional chaotic system.First,to enhance the randomness of the chaotic sequence,we design a new two-dimensional chaotic system using Cubic and Sine mappings.Experiments verify that its performance surpasses that of previous chaotic systems.Second,to enhance the performance and security of the shuffling and diffusion phases in the encryption algorithm,we introduce a pixel replacement method based on the characterics of cyclic groups.Furthermore,this algorithm fully leverages the multi-band characteristics of remote sensing images and optimizes the encryption effect by enabling each band to cross-confuse with others during the encryption process.Experimental results demonstrate that the algorithm offers a large key space and high security,making it resilient to common cryptanalytic attacks.