Abstract:    Itmainly introduces the method forresolving the differential code bias of satellites and stations, and uses the loworder spherical harmonic function model to estimate the parameters of the system hardware delay, 10 IGS stations from European region are chosen as a net, a VTEC model is calculated every 15 minutes, The accuracy and stability of the results are compared with the results published by IGS. The calculated results are in agreement with the results of IGS. For the magnetic storms occurring on March 17, 2015, the electronic content of the ionosphere over the station is studied by using the electronic content adjusted with the differential code bias. It shows that it can reflect the magnetic storm phenomenon better.