Abstract: The present disclosure discloses sodium ion channel inhibitors, pharmaceutically acceptable salts and polymorphs thereof, and uses thereof. Specifically, the present disclosure discloses a polymorph of a compound of formula (X) and a preparation method thereof. The preparation method of the present disclosure is simple in operation and suitable for industrialization. The polymorph prepared by the preparation method has advantages of good stability, low hygroscopicity and high water solubility.