The efficiency evaluation and tactics calculation of radar jamming is a puzzle that the troops of radar countermeasure have met and urgently need to solve but lack of system research. To solve this puzzle, the efficiency evaluation models of shooting degrees and kill probability against guidance radar under passive self-defensive jamming condition are established by analytical method, then, the tactics calculation methods of anti-radar reflector beam numbers, expending time interval and total wastage are also given. Finally, the effectiveness and feasibility of the models are illustrated with a numerical example and some valuable conclusions are reached, which can provide a reference for the operational efficiency evaluation and airborne weapon equipment.