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We study pentaquark $\Theta^{+} (I=0,J=1/2)$ in the QCD sum rules emphasizingthat we can not extract any properties of the pentaquark outside of the Borelwindow. To find the appropriate Borel window, we prepare a favorable set up ofthe correlators and carry out the operator product expansion up to dimension 15within factorization hypothesis. Our procedures reduce the unwanted high energycontaminations and enhance the low energy correlation. In the Borel window,independent analyses for the chiral-even and odd sum rules give the consistentvalues of the $\Theta^+$ mass, $1.68\pm0.22$ GeV, and the residue. The parityis found to be {\it positive}.

Exotic Hadron in Pole-dominated QCD Sum Rules