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In this work, we study the masses of $Qq\bar Q\bar q'$ states withJ^{PC}=0^{++}, 1^{++}, 1^{+-} and 2^{++} in the chiral SU(3) quark model, whereQ is the heavy quark (c or b) and q (q') is the light quark (u, d or s).According to our numerical results, it is improbable to make the interpretationof $[cn\bar c\bar n]_{1^{++}}$ and $[cn\bar c\bar n]_{2^{++}}$ (n=u, d) statesas X(3872) and Y(3940), respectively. However, it is interesting to find thetetraquarks in the $bq\bar b\bar q'$ system.

$Qq\bar Q\bar q'$ States in Chiral SU(3) Quark Model