We present a measurement of the top quark mass (Mtop)in the
all-hadronic decay channel using 5.8fb{-1} of p\bar{p}$ data collected
with the CDF II detector at the Fermilab Tevatron Collider. Events
with 6 to 8 jets are selected by a neural network algorithm and by the
requirement that at least one of the jets is tagged as a b quark jet. The
measurement is performed by a likelihood fit technique, which determines
simultaneously Mtop and the jet energy scale (JES) calibration. The fit
yields a value of 172.5 +- 1.4(stat) +-1.0(JES) +-1.1(syst) GeV/c2.