Abstract:Abstract: Under the control of net being under construction specifically for city orbit traffic GPS , necessity having suggested that under the control of net checks in the period being under construction. On basis comparing in detecting net design optimization , new old under the control of net achievement analysis, the conducting wire having discussed that GPS under the control of net is ground starts counting from burning to the significance guiding to be versed in accuracy, the example indicates detecting method validity , give under the control of net detecting out the value suggesting that the similar project has a reference to other rationally at the same time.