Quinoline compound salt or crystal form, preparation method therefor, and application thereof

A method for preparing a compound shown in Formula (I), characterized in that the method comprises:

• reacting a compound shown in Formula (II) with a compound shown in Formula (III) to form a compound shown in Formula (IV);
• reacting the compound shown in Formula (IV) with an acid to form a compound shown in Formula (V);
• and
• reacting the compound shown in Formula (V) with 2,4-diamino-6-chloropyrimidine-5-carbonitrile to form the compound shown in Formula (I);
• wherein the group R3 in each of the compounds shown in Formulas (II), (IV) and (V) is the same as the group R3 in the compound shown in Formula (I);
• the groups R1 and R2 in the compounds shown in Formulas (III), (IV) and (V) are respectively the same as the groups R1 and R2 in the compound shown in Formula (I);
• and
• X in the compounds shown in Formulas (III), (IV) and (V) is selected from N or CH.