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We study the quark-gluon mixed condensate g<\bar{q} sigma G q>, which isanother chiral order parameter, using the SU(3)c lattice QCD with theKogut-Susskind(KS) fermion at the quenched level. We generate 100 gaugeconfigurations on the 16^4 lattice with \beta = 6.0, and measure the mixedcondensate at 16 points in each gauge configuration for each current-quark massof m_q=21, 36, 52 MeV. From the 1600 data for each m_q, we find the ratiobetween the mixed condensate and the quark condensate, m_0^2 = g<\bar{q} sigmaG q> / <\bar{q}q> \simeq 2.5 GeV^2 at the lattice scale of 1/a \simeq 2 GeV inthe chiral limit. The large value of the mixed condensate suggests itsimportance in the operator product expansions in QCD.Comment: 3 pages, Talk given at 5th International Conference Quark confinement  and the hadron spect rum, Gargnano, Italy, 10-14 Sep. 200

LATTICE QCD STUDY FOR THE QUARK-GLUON MIXED CONDENSATE $g\langle {\bar q}\sigma_{\mu \nu} G_{\mu \nu} q\rangle$