The　transmission　capacity　of　Hierarchical　Wireless　Mobile　Ad　Hoc　Networks　(H-MANET)　have　been　studied　in　this　paper.　Firstly,　the　structural　protocol　model,　node＇s　mobility　tracking　model　of　H-MANET　were　presented.　Secondly,　A　critical　inequality　of　transmission　capacity　of　H-MANET　have　been　presented　and　proved.　At　last,　a　gradual　probabilistic　quality　and　the　specific　expression　of　expectant　availability　of　transmission　capacity　of　H-MANET　have　also　been　given　and　proved　in　the　paper.　In　certain　degree,　this　paper　enriches　the　theory　of　[1]　and　information　theory　of　wireless　networks.