Screen fixing method

The present invention provides a method for fixing screen portion. Said method is characterized by that it includes the following several steps: step 1, successively combining door window filter, lenticular double-convex lens and Fresnel lens to form screen portion, and mounting the screen portion on a screen box body whose upper and lower sides and left and right sides can at least form more than one supporting portion; step 2, using at least more than one wire to make the above-mentioned screen portion be connected with said supporting portion at upper and lower sides and left and right sides of said screen box body; and step 3, raising stretching force of the wire to make the screen portion and screen box body implement forced light combination, so that said fixing method can prevent the between of lenticular double-convex lens, Fresnel lens and door window filter from producing space phenomenon.