Abstract: Exploring the properties of weakly bound nuclei in the dripline region is of great significance to nuclear physics research. Traditional shell models based on harmonic oscillator bases cannot treat reasonably the weakly-bound nature. In this study, we use the Gamow shell model which includes the continuum. Based on a chiral two- plus three-nucleon force, using the Gamow Hartree-Fock method, we self-consistently construct Berggren bases that include bound states, resonant states and non-resonant continuum states. Recent experimental results have confirmed the double magic nature of ⁷⁸Ni, making it possible to calculate the energy of neutron-rich nickel isotopes. This paper begins with the ⁷⁹Ni calculation and investigates the low-energy structure of neutron-richer nickel isotopes. The results reveal the importance of the continuum effect and also predict the position of the neutron dripline of the nickel chain. These calculations should be useful in understanding the nucleosynthesis process in astrophysics.