  We demonstrate the dissipationless transport of the chiral edge state (CES)
in the nanodevices of quantum anomalous Hall insulator candidate MnBi2Te4. The
device presents a near-zero longitudinal resistance together with a quantized
Hall plateau in excess of 0.97 h/e2 over a range of temperatures from very low
up to the Neel temperature of 22 K. Each of four-probe nonlocal measurements
gives near-zero resistance and two-probe measurements exhibit a plateau of +1
h/e2, while the results of three-probe nonlocal measurements depend on the
magnetic field. This indicates non-dissipation as well as the chirality of the
edge state. The CES shows three regimes of temperature dependence, i.e.,
well-preserved dissipationless transport below 6 K, variable range hopping
while increasing the temperature and thermal activation at higher than 22 K.
Even at the lowest temperature, a current of over 1.4 {\mu}A breaks the
dissipationless transport. These form a complete set of evidences of the Chern
insulator state in the MnBi2Te4 systems.
