Abstract: Three different kinds of natural gas measurement involved in energy determination are discussed. Because of the way for mass transmitting and tracing is distinguish, methods estimating uncertainty of measuring results are also very different. Recently technological developments in energy determination area have already gained quite great progress in our country, but there is still a considerable gap with advanced world level in architecture, obtaining and usage of traceability. In view of this, following research and development works must be completed as soon as in future: ① Publishing national standard of traceability guideline for natural gas analysis; ② building 0 class calorimeter with relative expended uncertainty (U) better than 0.3% (k=2); ③ getting ready for MCM simulation method for evaluating the uncertainty of the energy measurement system of natural gas pipeline network.