The invention discloses a software anti-interference method used for an electric energy meter. A coding number is arranged for data information in software and is encrypted; when the data information is read, the coding number in the data information is verified; if the coding number is correct, the data information can be read; and if the coding number is not correct, a backup record is read and coding number verification is carried out; and the data information can not be read until the coding number is correct and then a program is operated; power-on mark information is established at a specific RAM region and it is determined whether the system is in a power-on reset state or a system reset state so as to decide whether to carry out system initialization or system recovery. If it is necessary to carry out system recovery, according to determination on a corresponding coding number, data information in a corresponding record is read. According to the invention, unstable operation of a system can be avoided, wherein the unstable operation is caused by an external interference; system data information will not be damaged or lost; and a preset operation can be correctly executed under circumstances that it is unnecessary to modify hardware and software systems by shutdown of the system.