Abstract: The article introduces the structure of Coriolis Mass Flowmeters used in Lanzhou-Chengdu-Chongqing Products Pipeline, analyzes the major influence factors such as stress and zero which will impact the steady running of the mass flowmeters. Temperature and pressure will influence the measurement of mass flowrate. Effective measures to eliminate pressure and stabilize zero steady are worked out in order to ensure calibration and stable running of the flowmeters.