According to the geomagnetic indices and solar F_(10.7) index,the complicated space environment can be briefly divided into four typical types namely 00,01,10 and 11 type. The statistics show that the ratio of disturbance (01,10 and 11) events is on a downward trend in recent four solar cycles. With TianGong-1 onboard GPS data as the "measured data"and reference orbit", the prediction accuracy and the solved satellite drag coefficient C_d associated with the four typical space environments were analyzed. There was no significant change of the solved C_d under 00 and 10 type space environments,but under 01 and 11 type space environments, C_d showed a decline 1 d before the magnetic disturbance, and a sharp increase on the magnetic disturbance day and1 day after. This method has some reference value for the precise analysis of the prediction error or covariance evolution.
