Abstract: Based on the research of OPGW DC ice-melting monitoring technology, we studied the condition monitoring of high-voltage transmission lines in non-Ice-covered period based on optical fiber sensing technology to improve the richness and investment utility of comprehensive detection of transmission line status. The main external influencing factors of stress and temperature in the non-Ice-covered EHV transmission line are studied. Experimental results show that the non-Ice-coating transmission line condition monitoring technology based on optical fiber sensing can effectively identify these two external environments.