The basic principles and system structure of typical DOFS technology were compared and summarized， and the development status of existing transmission line icing monitoring technology was introduced. A multi-dimensional parameter distributed optical fiber sensing technology was proposed that could realize the distributed real-time monitoring of state parameters， such as strain， temperature， vibration， and attenuation in the lines. In comparison with the existing single-parameter and dual-parameter sensing monitoring schemes， the accuracy of monitoring could be effectively improved， and the rate of misjudgment and false alarm could be reduced by using a multi-dimensional parameter scheme for fusion sensing of lines， providing important protection for the safe and stable operation of transmission lines.