Abstract: Because of double refraction effect, Shupe effect and some fragile optic component, a micro FOG can't work in a wide temperature range and high impact test environment. A new structure optimization design has been proposed by finite element thermal analysis and shock isolation theory to make sure the micro FOG can work effectively under range of -45~65℃ and half sine impact test. The experiment results prove that this structure optimization method can guarantee the accuracy of FOG and its environmental adaptability has been greatly improved.