Abstract: This paper describes a fractal calculation method for examining the self-similarity of energy distribution of the micro-seismic events produced by rock bursts in drill-and-blast method (DBM) excavation and tunnel boring machine (TBM) excavation, using micro-seismic data collected during the construction of the deep tunnels with an overburden layer of 1500-2500 m at the Jinping-II hydropower station in Sichuan, China. Results show that fractal behaviors and good self-similarity are two major features of the micro-seismic energy distributions in the evolution of immediate rock bursts. The energy fractal dimensions of the DBM and TBM excavation rock bursts are less than 0.2 and greater than 0.3 respectively. Generally, weak rock bursts have lower energy fractal dimensions. Micro-seismic energy fractal dimensions are useful for developing a warning system and reducing the risk of rock bursts during construction.