In practical engineering application

when lack of high precision laboratory calibration device

it is very necessary to study simple and available outfield calibration algorithm for MEMS inertial device. On the basis of analysis on error model of MEMS inertial device

propose an outfield calibration method that based on algorithm of ellipsoid model value constraint

and through designing reasonable experimental layout scheme and effective algorithm to realize estimation of error model parameters. By comparing experimental results

it shows that the proposed calibration method is available

and error coefficient within reasonable range of error

which proves validity of this method.