Abstract: Based on geomagnetic observation data during 20062015 in Tonghai,the analysis of the geomagnetic environmental field and each variation of the geomagnetic field components have been done.We have some research on consistent level as to the annual average level at the stations and IGRF model calculated values,and we also have calculated anomalous filed modulus.The results show that the sea geomagnetic values in 2011,2014 and 2015 vary rapidly.Studies show that during 2006 to 2015 sea tableland magnetic data is of high reliability,and of a high degree of variation with synchronization model values.In addition geomagnetic measured value and model value change trends coincide.