A process for preparing a solid catalyst component suitable for producing polyethylene and its copolymers, said process comprising the steps of: (a) contacting a dehydrated support having hydroxyl groups with a magnesium compound having the general formula MgR 1 R 2, wherein R 1 and R 2 are the same or different and are independently selected from the group comprising an alkyl group, alkenyl group, alkadienyl group, aryl group, alkaryl group, alkenylaryl group and alkadienylaryl group; (b) contacting the product obtained in step (a) with modifying compounds, and, wherein: is at least one compound selected from the group consisting of carboxylic acid, carboxylic acid ester, ketone, acyl halide, aldehyde and alcohol, wherein the carboxylic acid ester is selected from the group consisting of methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, isoamyl acetate, ethyl butyrate, n-butyl butyrate and isobutyl butyrate; is a compound having the general formula R 11 f (R 12 O) g SiX h, wherein f, g and h are each integers from 0 to 4 and the sum of f, g and h is equal to 4 with a proviso that when h is equal to 4 then modifying compound is not an alcohol, Si is a silicon atom, O is an oxygen atom, X is a halide atom and R 11 and R 12 are the same or different and are independently selected from the group comprising an alkyl group, alkenyl group, alkadienyl group, aryl group, alkaryl group, alkenylaryl group and alkadienylaryl group; is a compound having the general formula (R 13 O) 4 M, wherein M is a titanium atom, a zirconium atom or a vanadium atom, O is an oxygen atom and R 13 is selected from the group comprising an alkyl group, alkenyl group, alkadienyl group, aryl group, alkaryl group, alkenylaryl group and alkadienylaryl group; and (c) contacting the product obtained in step (b) with a titanium halide compound having the general formula TiX 4, wherein Ti is a titanium atom and X is a halide atom. (a) contacting a dehydrated support having hydroxyl groups with a magnesium compound having the general formula MgR 1 R 2, wherein R 1 and R 2 are the same or different and are independently selected from the group comprising an alkyl group, alkenyl group, alkadienyl group, aryl group, alkaryl group, alkenylaryl group and alkadienylaryl group; (b) contacting the product obtained in step (a) with modifying compounds, and, wherein: is at least one compound selected from the group consisting of carboxylic acid, carboxylic acid ester, ketone, acyl halide, aldehyde and alcohol, wherein the carboxylic acid ester is selected from the group consisting of methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, isoamyl acetate, ethyl butyrate, n-butyl butyrate and isobutyl butyrate; is a compound having the general formula R 11 f (R 12 O) g SiX h, wherein f, g and h are each integers from 0 to 4 and the sum of f, g and h is equal to 4 with a proviso that when h is equal to 4 then modifying compound is not an alcohol, Si is a silicon atom, O is an oxygen atom, X is a halide atom and R 11 and R 12 are the same or different and are independently selected from the group comprising an alkyl group, alkenyl group, alkadienyl group, aryl group, alkaryl group, alkenylaryl group and alkadienylaryl group; is a compound having the general formula (R 13 O) 4 M, wherein M is a titanium atom, a zirconium atom or a vanadium atom, O is an oxygen atom and R 13 is selected from the group comprising an alkyl group, alkenyl group, alkadienyl group, aryl group, alkaryl group, alkenylaryl group and alkadienylaryl group; and is at least one compound selected from the group consisting of carboxylic acid, carboxylic acid ester, ketone, acyl halide, aldehyde and alcohol, wherein the carboxylic acid ester is selected from the group consisting of methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, isoamyl acetate, ethyl butyrate, n-butyl butyrate and isobutyl butyrate; is a compound having the general formula R 11 f (R 12 O) g SiX h, wherein f, g and h are each integers from 0 to 4 and the sum of f, g and h is equal to 4 with a proviso that when h is equal to 4 then modifying compound is not an alcohol, Si is a silicon atom, O is an oxygen atom, X is a halide atom and R 11 and R 12 are the same or different and are independently selected from the group comprising an alkyl group, alkenyl group, alkadienyl group, aryl group, alkaryl group, alkenylaryl group and alkadienylaryl group; is a compound having the general formula (R 13 O) 4 M, wherein M is a titanium atom, a zirconium atom or a vanadium atom, O is an oxygen atom and R 13 is selected from the group comprising an alkyl group, alkenyl group, alkadienyl group, aryl group, alkaryl group, alkenylaryl group and alkadienylaryl group; and (c) contacting the product obtained in step (b) with a titanium halide compound having the general formula TiX 4, wherein Ti is a titanium atom and X is a halide atom.