Abstract: Collapse column is a common geological disaster in coal mining, underground karst water threatens to coal mine safety by subsided column guide rise. The three - dimensional seismic exploration is an effective mean of detecting subsided column, but it still can not meet mine geology tasks. The maximum offset had a certain influence on the detection of collapse column, taking coal field collapse column as basis and building collapse column model, we use acoustic wave equation to simulate the influence of different maximum offset on collapse column and deal with seismic record in consideration of the principles of the single factor changes. We thick that small offset is advantageous to the exploration of collapse column after comparison and analysis on the stack profile.