FEAL作为一种快速的加密算法 ,在安全性要求较低的领域中 ,有着非常广阔的应用前景 .文中在分析FEAL算法中子密钥与明文结合形成密文工作流程的基础上 ,找出了密文与明文之间的比特依赖性 ,提出通过增强密文与明文间比特依赖性提高该算法安全性的两种方法 ,在确保其高速的情况下增大了FEAL算法的安全性 FEAL, as a fast encryption algorithm, has very broad application prospects in the field of low security requirements.Based on the analysis of FEAL algorithm, sub-key combined with plaintext to form ciphertext workflow, FEAL finds out The paper proposes two methods to improve the security of the algorithm by enhancing the bit-dependency between ciphertext and plaintext, and increases the security of FEAL algorithm under the condition of ensuring its high-speed