In　order　to　address　the　denitrification　problems　of　sewage　plant　effluent,　type-A　molecular　sieve　was　synthesized　by　hydrothermal　method　with　four　different　process　schemes,　using　natural　zeolite　as　a　raw　material　that　was　collected　from　Gongyi,　Henan　Province.　The　synthesized　product　was　examined　for　its　adsorption　performance　on　ammonia　nitrogen,　purity,　crystal　structure,　morphology,　porosity　and　other　structural　characteristics.　The　suitable　process　scheme　for　synthesizing　high　efficiency　molecular　sieve　from　natural　zeolite　was　then　explored.　The　alkali　melting　activation　process　was　more　effective　than　the　direct　alkali　dissolution　process　in　terms　of　the　silicon　source　utilization　from　the　raw　material,　while　the　product　from　silicon　source　purification　synthesis　scheme　had　a　significantly　improved　ammonia　nitrogen　adsorption　performance,　with　an　equilibrium　adsorption　capacity　of　more　than　20mg/g.　It　was　associated　with　orderly　crystal　morphology,　low　impurity　contents,　and　unobstructed　pore　channels,　all　of　which　were　conducive　to　adsorption,　diffusion　and　other　mass　transfer　processes.　By　comprehensively　considering　the　energy　and　materials　consumption　for　synthesis　and　the　adsorption　properties　of　the　synthesized　product,　the　process　scheme　of　alkali　dissolution　and　silicon　source　purification　was　deemed　as　the　suitable　process　plan　to　type　A　molecular　sieve　using　natural　zeolite.　©　2020,　Editorial　Board　of　China　Environmental　Science.　All　right　reserved.