The present invention relates to the crystal form of a fibroblast growth factor receptor 4 inhibitor and its preparation method thereof, as well as a pharmaceutical composition containing a therapeutic effective amount of the compound and its application in the treatment of cancer. The preparation method has good crystal stability, no moisture absorption, good solubility, good adaptability in the preparation process, good drug dissolution behavior and good bioavailability in vivo. Moreover, the preparation process is simple and the yield is high. And it is suitable for industrial production.本發明涉及的FGFR4抑制劑的晶型及其製備方法，以及含有治療有效量的該類化合物醫藥組成物和在治療癌症的應用。本發明製備的晶型穩定性好、不具有引濕性，溶解度良好，在製劑生產過程中具有良好的適應性，能實現藥物良好的溶出行為，確保藥物在體內具有良好的生物利用度。並且晶型製備工藝簡單，收率高，適合工業化生產。
