In the manuscript "Investigate on the Compression-shear Coupled Stress Waves Propagating in Heterogeneous Rock", the true triaxial experimental testing system is employed to measure the longitudinal wave velocities of three samples: granite (i), mortar model material (ii, MMM), and mortar model material with coarse aggregates (iii, MMMA), under different triaxial confining pressures. Here, the initial electrical signal data received on the strain gauge is provided and recorded. The measured position is consistent with that shown in Figure D1 in the manuscript.