We　have　developed　a　simple　and　practical　copper-catalyzed　method　for　the　synthesis　of　1,2,4-benzothiadiazine　1,1-dioxide　derivatives　via　cascade　reactions　of　substituted　2-halobenzenesulfonamides　with　amidines,　and　the　method　is　of　value　for　the　construction　of　this　kind　of　molecules　with　biological　and　medicinal　activities.