The current signal jammer has a new type of signal shielding technology, which has a high interference effect. It can cover the communication area in the examination room, effectively shield the Mobile phone signal in the examination room, and ensure its fairness. The current signal blocking devices have excellent performance, effectively isolating the connection between mobile phones and communication signals. These blocking devices are easy to operate and convenient to use. In addition, the shield also has good stability and reliability, so that it can be used for a long time during exams. In some particularly important exams, it is necessary to ensure discipline in the exam room. In order to ensure that the exam is just in case, more and more test halls have adopted signal jammers to shield the Mobile phone signal in the exam room to avoid the impact during the exam. So far, some shielding devices have become the most ideal choice for the middle school and college entrance exams. The use of cheating methods in exams can increase the difficulty and pressure of maintaining discipline and order in the exam room. The main means of cheating are the use of these communication devices, which require the existence of different signal blocking devices. I believe this is still very helpful in ensuring a fair environment for exam room order. In complex teaching buildings, the role and performance advantages of signal jammers are fully utilized to ensure that various behaviors of mobile phone cheating can be completely eradicated.