Abstract: The traditional experiment of measurement gravity acceleration using the simple pendulum has many problems such as large error, complicated operation, large reading error and long time during the operation process.By using intelligent simple pendulum instrument to measure acceleration of gravity, we can realize automatic counting, automatic timing, automatic calculation and display of the results.It is helpful to study the relationship between the acceleration of gravity and the number of pendulum swing, pendulum length and swing angle.In this paper, the single-chip intelligent operation is used to improve the measurement accuracy, make the acceleration of traditional method to measure the gravity acceleration with simple pendulum be greatly improved, and simplify the experimental process while making the experimental results more accurate.