A high g

n

piezoresistive accelerometer with 4-beam mass is designed.Measuring range is 0～（150 000 g

n

）;the extreme impact is 200 000 g

n

;transverse sensitivity is less than 6 %.According to the target and the condition of strength

the structure parameters are optimally designed

the analyses of the stress

the ability of resisting impact

the transverse sensitivity are processed.The static stress and modal properties are analyzed by FEA.Through the analysis result is compared with the theoretical result

the analysis for the structure and design of the accelerometer are completed more rational.