provided are crystalline form i of - n -- phenylamino )- 3 - cyano - 7 - ethoxy - quinolin - 6 - yl )- 3 - propenamide dimaleate , preparation methods thereof , and pharmaceutical compositions containing the same . the crystalline form i of shr1258 dimaleate has good crystal stability and chemical stability , and can be used in the preparation of medicaments for treating diseases related to egfr receptor tyrosine kinase or her - 2 receptor tyrosine kinase .