Catalytic　hydroamination　of　the　readily　available　alkenes　is　among　the　most　straightforward　means　to　construct　diverse　alkyl　amines.　To　this　end,　the　facile　access　to　both　regioselectivity,　i.e.,　Markovnikov　or　anti-Markovnikov　hydroamination,　with　minimum　reaction-parameter　alternation,　remains　challenging.　Herein,　we　report　a　cobalt-catalyzed　highly　selective　and　divergent　Markovnikov　and　anti-catalyzed　highly　divergent　Markovnikov　hydroamination　of　alkenes,　in　which　the　switch　of　regioselectivity　is　achieved　simply　by　the　variation　of　the　addition　sequence　of　9-BBN.