The invention relates to a salt, a hydrate or a crystalline form of an EGFR inhibitor, and use thereof. Specifically it relates to 4-[ (3-chloro-4-fluorophenyl) amino] -7-methoxy-6- [3-[ (1R, 6S) -2, 5-dioxa-8-azabicyclo [4.3.0] nonan-8-yl] propoxy] quinazoline dimethanesulfonate, hydrate and a crystalline form thereof; the invention also relates to a preparation method of the crystalline form disclosed herein, a pharmaceutical composition containing the crystalline form, and uses thereof for treating proliferative disorders.