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The Jeans instabilities in an unmagnetized,collisionless,isotropic self-gravitating matter system are investigated in the context of κ-deformed Kaniadakis distribution based on kinetic theory.The result shows that both the growth rates and critical wave numbers of Jeans instability are lower in the κ-deformed Kaniadakis distributed self-gravitating matter systems than the Maxwellian case.The standard Jeans instability for a Maxwellian case is recovered under the limitation κ =0.