A laser cutting process for the fracture splitting notch of a connecting rod was researched in this paper.According to the material behaviors, energy balance and the changes of hole shapes, the process was divided into three stages, initial state, quasi-steady destruction and tail stage.The affects of pulse width, waveform, pulse frequency and cutting speed on the notch root radius were analyzed, and a new pulse waveform was designed to satisfy the request of notch root sharpness.Analysis and experimental results show that a long pulse width combined with a reasonable cutting speed is the key to obtain a sharp fracture splitting notch.When the pulse width is set to be 1 ms, cutting speed to be 10 mm/s, the sharp fracture splitting notch can be obtained.Furthermore, for a deeper and sharper notch, it can be transformed into many long pulse processing by increasing the frequency.When the frequency is increased to 40 Hz, pulse width to 0.5 ms, the fracture splitting notch with a larger aspect ratio and a sharp root can be obtained.By comparison of the morphologies for the fracture splitting notch,it indicates that proposed process can achieve the sharp fracture splitting notch with higher quality by injecting energy reasonably into each stage in laser processing.