To the issue of MIMO airborne radar clutter modeling under different environment conditions,a clutter modeling method based on composite model was proposed by taking clutter amplitude distribution model,clutter cell scattering model and radar parameter model into consideration.Then,the error factors such as element error,channel uncertainty,clutter fluctuation were analyzed,and a clutter modeling method based on composite model under nonideal conditions was proposed.Finally,computer simulations were made to the space-time MV spectrum and the characteristic spectrum under different error conditions,different clutter amplitudes,and the back-scatter coefficients,through changing the model parameters.The simulation results show that:in ideal conditions,the clutter spectrum has good space-time characteristic;while in nonideal conditions,the clutter fluctuates tempestuously,and fluctuation is different under different environment conditions.