The paper redefines the concept of detection range, detection square, and warning time after early warning radar is jammed, and establishes the tactical efficiency index for the convenience of description.

Upon multiple times of detection,it was found that the fault was not caused by the quality,installation or debugging problem of the measuring element,but by the expansion of the heated main shaft that led to the decrease in effective detection area of vibration sensor and the failure to meet the minimum measuring area a.

Based on generic free observation surface and free reflecting boundary,put forward 3D seismic common-reflection surface element asymmetric trace gather sorting stacking or known as "scale method".

Th e working experiences on method of common reflection bin stacking by asymmetric tr ace gathering has summarized,and submitted processing thinking and counting met hod of free observation surface,free reflecting boundary,common reflection bin stacking method by asymmetric trace gathering.