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While I am relaxing a structure with high precision, there is the following message .
14F = -.27745270E+03 E0 = -.27721155E+03 dE =-.545020E-04 MAG = 8.9980
ZBRENT: can't locate minimum,use default step

my INCAR is seted as the following:
ISTART =0
ICHARG = 2
PREC = Accurate
ENCUT = 500 (1.3 * ENMAX)
EDIFF = 0.1E-4
ISPIN = 2
ISMEAR = 0
SIGMA = 0.2
NSW = 100
IBRION = 2
POTIM = 0.5
EDIFFG = 0.5E-2
ISIF = 3
LREAL = Auto
ADDGRID = .True.

Anyone has some idea about this? Thank you very much !

this has been answered in the forum before: it means that Brent's algorithm did not succeed to estimate the next geometry step.

and if the required accuracy is reached, can the value still be considered accurate?

yes

if you look at the forces in the OUTCAR then the forces should be less than the accuracy you have set which means that the structure is already reached required accuracy