The invention belongs to the technical field of pharmaceutical chemistry, particularly relates to three crystal forms comprising H, I and J of 2-(3-cyan-4-isobutoxy)phenyl-4-methyl-5-thiazole formic acid (Febuxostat) and a preparation method of the three crystal forms. The invention also provides X-ray powder diffraction characteristic absorption peaks and infrared absorption peaks of the three crystal forms. The characteristic absorption peaks occur at the reflected angles 2 theta of about 6.71, 7.19, 10.03, 11.10, 12.96, 13.48, 15.78, 17.60 and 22.15 degrees in an X-ray powder diffraction pattern of the crystal forms. The invention further relates to a pharmaceutical composite containing the novel crystal forms and application of the novel crystal forms in preparation of medicaments fortreating over-high uric acid-related diseases.