Based on model experiment and practical application of magnetic method for detection of underground cultural relics,this paper systematically describes the mechanism,technique,character and effects of applying magnetic method to the detection of underground cultural relics.From survey through data processing to interpretation of achievements,it probes step by step into the working method,technological features,anomaly regularity and means for inference and interpretation of magnetic archaeology.With practical examples,the paper recommends an oprable and popularizable working system,emphatically deals with the merits and prospects of magnetic archaeology,and points out the content and direction of further research work.