Abstract: Based on the fictitious compress recovery approach the fictitious downward continuation is clarified,which has theoretically solved the downward continuation of gravity field.To test the correction of the theory,simulation experiments are executed using EGM96 model.Simulation experiment results support the local fictitious downward continuation approach.Meanwhile,in the case that the observation values contain random errors,the simulation experiment tests show that the local fictitious downward continuation approach is stable,almost not losing the accuracy.