arXiv:2610.21056v1 Announce Type: new Abstract: This paper studies numerical methods for the time fractional diffusion-wave equations with the constant delay. Using a symmetric fractional-order reduction technique and introducing the auxiliary variable $w$, we reformulate the original problem as an equivalent coupled system and for the first time carry out a rigorous regularity analysis of $w$. Based on the symmetric graded time mesh, the coupled problem is discretised by the $L1$ scheme in time and a standard finite element method in space, and the stability result of the developed fully discrete finite element scheme is established by means of a discrete fractional Gr\"onwall inequality. Furthermore, we derive a new comparison principle and reconstruct a new barrier function on each interval $((k-1)\tau,k\tau]$, $1\le k\le K$ according to the properties of the symmetric graded mesh. Based on the new barrier function, we obtain new relevant properties, which lead to a novel and crucial stability property for the discrete fractional operator. Combining the obtained local truncation error in time gives a local error estimate for the fully discrete finite element scheme, which shows that our convergence result provides a unified framework that seamlessly encompasses both pointwise-in-time error estimates on uniform meshes and global-in-time error estimates on symmetrical graded meshes. Numerical experiments confirm the theoretical results.