To reduce the burden of storage and tr ansmission of encrypted images,an image encryption algorithm combining compressi ve sensing with variable-parameter chaotic mapping is proposed.In this algorith m,both the compression and encryption of an image can be achieved simultaneously.In the pr ocess of compressive sensing, the measurement matrix is generated by variable-parameter chaotic mapping and d iscrete cosine transform (DCT) m atrix is selected as sparse basis matrix which is incoherent with the measurement matrix.To further strengthen th e security of the encryption scheme,a disturbance factor is introduced to make the cipher keys and the plain -text correlated.Meanwhile,the encryption algorithm possesses the ability to resist different attacks with depe ndent scrambling and diffusion operations.Each pixel of the encrypted images is encoded with 8bits to facilit ate storage,display and transmission. Experimental results demonstrate that the proposed encryption algorithm is feas ible,effective and secure.