Calorific value measurement is the main obstacle of implementing natural gas energy determination technology in China. China has published a series of national standards on the direct and indirection determination of natural gas calorific value, but compared with best international practices, there are still some gaps on standardization of terminology and definition, structure of traceability chain, confirmation of the standard methods, development of RGM (Reference Gas Mixture), and the estimation of measuring uncertainty, etc. Therefore, the conditions are not ready for China to fully implement energy determination. To deal with possible International trade disputes in current international environment, it is suggested to implement the traceability report based on imported RGM, compare the results with the level-0 calorimeter of Korean Research Institute of Standards and Science, and complete the development of level-0 calorimeter with better than 0.35% accuracy as soon as possible.