In recent years, Android system as a good open source system is widely used in various scenarios. But because of the diversity and nonnormality of hardware devices, many hardware devices will change MAC addresses every time they start. In view of the above problems, proposing a method to fix the MAC address with the software at the bottom of the Android system. This method saves a MAC address to a file through script at the first time of the system startup. The system obtains the saved MAC address every time it starts and configures it on the network card, so as to realize the purpose of fixing the MAC address. The experimental results show that the proposed method can realize the function of fixed MAC address, and it has the advantages of reduced production cost and simple realization method.