Electron-phonon interaction underlies the conventional and exotic electrodynamics. Moreover, specific phonon modes have emerged as an efficient channels to modulate band structures, transport, and topology on picosecond time scales and with high precision in atomic motions. Such an ultrafast phonon control could allow for achieving electronic states not accessible in static environments. However, the main physical quantity, the electron-phonon coupling (EPC) strength is highly theoretical in nature and has been measured via an averaged effect. In this talk, I will introduce the two-dimensional electron-phonon-coupling spectroscopy (2D EPC) that we have recently developed for directly extracting the EPC strength in a phonon mode- and electron energy-resolved manner. First, I will show our design principle of this new spectroscopy, quantum pathways that contribute to the observables, and how the EPC strength is quantified from the signal field. Then, the experimental realization, analysis protocol, and the proof of concept result on methylammonium lead iodide perovskite films will follow. Finally, I will discuss the potential of this 2D EPC spectroscopy in condensed matter physics.