Frequency agility in RADARs works good even when there is jamming. Jamming is a technique which is usually adopted to make a RADAR non-functional. Many kinds of technology can be applied to modern pulse radar to meet diversified jamming. Frequency agility refers to the radars ability to change its frequency rapidly over a wide operating range. By dynamically changing the frequency and sensing the channel at regular intervals yields better results. The practical application on a searching radar shows that the module has a good real time and anti jamming capacity.