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In the framework of quantum open systems we analyze data from KamLAND byusing a model that considers neutrino oscillation in a three-familyapproximation with the inclusion of the decoherence effect. Using a $\chi^2$test we find new limits for the decoherence parameter which we call $\gamma$,considering the most recent data by KamLAND. Assuming an energy dependence ofthe type $ \gamma = \gamma_0 \left( E/E_0 \right) ^n$, in 95 \% C.L. the limitsfound are $3.7 \times 10^{-24} GeV$ for $ n=-1$, $6.8 \times 10^{-22} GeV$ for$ n=0$, and $1.5 \times 10^{-19} GeV$ for $ n=1 $ on the energy dependence.

Parameter Limits for Neutrino Oscillation with Decoherence in KamLAND