Temporal coherent combination further extends the pulse duration by assembling many pulses in a train passed through the amplifier into one output pulse, which can improve the peak power and pulse energy effectively and avoid nonlinear effects excited by the high peak power in the amplification. Spatial and temporal pulse combination can overcome limitations in single fiber laser, potentially leading to higher pulse energy, average power and peak power of ultrafast pulses currently only available from bulk amplifiers with low repetition rates. In this paper, the principles and key technologies of temporal coherent combination of ultrafast pulses in fiber lasers are introduced. The current status of temporal coherent combination and their technologies are reviewed. Recent progress of Divided Pulse Amplification (DPA) and Coherent Pulse Stacking (CPS) is emphasized. Different technical ways are compared and analyzed. Several future perspectives are pointed out. The paper can be a reference for research on temporal coherent combination of chirped pulses.