NaOH　solution　was　used　as　the　modifier　for　fly-ash.　Through　orthogonal　experiments,　a　suitable　operating　condition　for　the　modification　was　selected.　The　modified　fly-ash　was　mixed　with　slaked　lime　and　adhesive　to　make　a　kind　of　nitric　oxides　adsorbent.　The　results　of　the　dynamic　state　experiments　show　that　the　adsorbent　named　B　made　from　the　modified　fly-ash　performs　better　in　NO　and　NO2　adsorption　than　the　adsorbent　named　A,　which　was　made　from　raw　fly-ash.　In　the　specific　condition　in　this　paper,　the　NOx,　adsorption　quantity　of　B　was　5.　36%　higher　than　that　of　A.　The　adsorption　mechanism　of　this　absorbent　can　be　attributed　to　physical　adsorption,　chemical　adsorption　and　absorption.