Abstract: First this paper briefly introduces the metrological technical assistance implemented by some developed countries and international metrology organizations and reviews the metrological technical assistance carried out by National Institute of Metrology, China from 2015～2020. Then SWOT method is applied to analyze the internal strengths and weaknesses and external opportunities and challenges facing China’s metrological technical assistance, which leads to preliminary researches on the development strategies in this regard. Last practical suggestions are proposed with a view to providing a reference for better implementing China's metrological technical assistance.