Based on UN Comtrade data, constant market share(CMS) Model is applied to explore the influencing factors of the growth of electromechanical products export from China to ASEAN during 2004 and 2020. The results show that the overall competitiveness effect is the main growth force of China's electromechanical products export, followed by the growth effect; while the specific competitiveness effect has the hindrance effect to China's electromechanical product export growth. The influence of product structure effect and pure second-order effect fluctuates between promotion and inhibition, but the impact on export growth is limited; the dynamic second-order effect decreases slightly year by year to a negative number, which hinders export growth.