This paper addresses some of the existing problems in intelligent electric meter, proposed to predict the reliability of the key components for intelligent electric meter, and designed input tables of reliability information for key components. The major type of faults of intelligent electric meter is discussed and analyzed, and the most common key component of failure is given. Input table of reliability information for each key component is designed on GJB/Z 299C, and working failure rate of each key component is obtained by calculating the relevant data information in table. This method has been taken to the implement and has a certain practical significance because of its easiness and simplicity.