Abstract: The optimization problem of finding physical pendulum extreme value is a common issue in physics experiments.When fixed the searching direction,the superior and inferior of the one-dimensional searching is the key of solving the optimization problen.In many methods of using the function itself to direct searching,compared to the golden section method（0.618） we usually use to find the extreme value,use fraction method（Fibonacci）in optimization have higher efficiency and more precise result.

Key words: fraction method, 0.618 method, optimization, extreme value, efficiency