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Using the chiral quark model, the ud s s system is studied by the Gaussian expansion method. Two configurations, i.e. diquark-antidiquark and molecular structures, are employed in the calculation. In the pure diquark-antidiquark or the molecular structure configuration, no bound state is found. However, the energy of the state ud s s with I(J P ) = 0(1 + ) is found to be lower than the corresponding threshold M K + M K * after taking into account the mixture of the two configurations. Future experimental research of this state is needed to check the validity of the channel coupling effect of the different color structures and the applicability of the chiral quark model to a multi-quark system directly.

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