The present invention relates to canagliflozin Monohydrate and its crystalline forms, which as compared to the prior art, have higher stability in water or aqueous system, are more suitable for wet granulation processes or suspension preparations and have good storage stability； the present invention also relates to preparation methods of canagliflozin Monohydrate and its crystalline forms, pharmaceutical compositions thereof and uses thereof in preparation of drugs for treating diseases such as diabetes, diabetes complications, obesity and so on.
