The failure of surrounding rock on rounded cavern was researched by means of a laboratory experiment. The rounded cavern model was loaded by the bidirectional loading system. The whole course data acquisition on surface speckle field of specimen was realized by image collection system. The test data was analyzed by the method on white light digital speckle. Evolution and distribution of displacement field and strain field were achieved on the whole destructive course of the cavern deformation. The experimental results showed that the failure of the cavern that it was acted by high stress was experienced localization stage on deformation. The V shaped pits were formed in surrounding rock of the cavern. The larger the load the more serious stress concentration was. And it was destroyed ultimately. The depth and width of the type of V-pit had some relationship with the cavern radius.
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