In this paper, we compare the advantages and disadvantages of karst collapse monitoring technology. Combining with previous experience, we put forward a notion that combines BOTDR with FBG to monitor soil deformation of Karst Collapse. Through analysing the karst collapse geological conditions east of Tangshan river, we selected experiment fiber,worked out laying scheme, and we described the test process in detail, explored the method of temperature compensation in the field, after repetitive data acquisition and analysis, we could conclude that optical fiber sensing technology could realize the multi-point positioning of rock and soil deformation, capture the rock and soil mass deformation and describe the collapse deformation boundary. By combining FBG with BOTDR in monitoring application, we can overcome the defects of the two monitoring methods, thereby obtaining all information of the collapse body,it has a useful application prospect.
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