Because most of the reversible information hiding algorithms have low embedd ing capacity,poor universality and large computation,in order to design better reversible information hiding algorithm, two information hiding algorithms are designed on the basis of image interpolation and reversible information hiding.Firstly,a kind of linear image interpolation method is designed,and the expectation interpolation of the ideal interpolated image is given.The embedded quantity control threshold is determined according to the size of the carrier image and the length of the secret information,then the secret information can be embedded in each interpolation pixel dynamically by the chaotic sequence,and then the difference adjustment factor is used.It makes the final interpolation close to the expected interpolation.The whole process has no a dditional information and no data spillover,and can guarantee the reversibility.When the constant amount of embedding is used,the embedding rate is 0.75T bit/pixel,where T ∈[1,4],and the maximum embedding rate can reach 3bit/pixel.When the random quantity is embedd ed,the adjustment is stronger,the secret information is more dispersed,and the quality of the encrypted image is higher.A lot of experiments are carried out on this algorithm in different carrier images and in different parameters,and compared with the 5excellent algorithms,the algorithm has some advantages.