A watermarking algorithm for the infrared image copyright protection was developed.The whole process was based on integer wavelet transform.Encrypted the grey scale image watermark by Logistic chaotic sequence,then wavelet transformed.Selected the perceptually significant wavelet coefficients,then inosculated in the given position of the original image.The watermark was detected hierarchically to save detection time.Experimental results show that the algorithm can be ensure the range of temperature in ±1%,which did not affect the application of the infrared image.Meanwhile,it is implemented fast,invisible and robust enough.