Gastrodia elata Blume (GEB) is a traditional herbal plant that has been used in Asian countries for centuries as an anticonvulsant analgesic, and a sedative for treating general paralysis, epilepsy, vertigo, and tetanus. This study was designed to optimize conditions for ethanol extracts or GEB by analyzing and monitoring the extraction characteristics with response surface methodology. The extract was used for analysis of the effective components of GEB. The estimated optimal conditions were 63.62% in ethanol of 5.06 mL/g in solvent per sample, and 6.25 hr in extract time. The optimal extraction conditions for $ gamma-aminobutyric$ acid, were 45.52%, 5.67 mL/g, and 6.04 hr, while those for $ ho-hydroxybenzyl$ alcohol were 62.73%, 5.02 mL/g, and 5.95 hr. Regression equation was generated for each variables and then superimposed them, such as soluble solid, $ gamma-aminobutyric$ acid and $ ho-hydroxybenzyl$ alcohol content thereby resulting in superimposed values of extinction conditions like $45sim65%,;5sim7mL/g$ and $5sim7$ hr, respectively.