The power spectrum method has been extensively and successfully used by geophysicists both in China and abroad to estimate the buried depth of magnetic bodies. However, the estimated results only statistically reflect the average buried depth of the magnetic bodies under the calculation window, and the estimating precision is thus affected as a result of equal window size and equal sliding step in calculation. In this paper, the authors have developed a visualized and high precision program that can select window size and site and sliding step voluntarily. Its application to a coal fire area demonstrates the practicability of the program.