This　paper　introduces　some　primitive　methods　about　hydro　information　transmission　firstly,　and　then　focuses　on　airborne　remote　sensing　real-time　transmission　system　and　point-to-point　duplex　transmission　in　real　time.　The　modes　of　hydro　information　transmission,　including　telephone　network,　satellite,　short　wave,　ultra　short　wave　and　computer　network　communication　etc,　have　realized　the　information　transmission　of　＇the　integration　of　Satellite-Airborne-Ground＇.　The　information　transmission　of　airborne　remote　sensing　real-time　transmission　system　adopts　the　transmission　of　＇Satellite-Airplane-Ground＇.　Point-to-point　duplex　transmission　system　in　real　time　consists　of　two　nodes　which　have　the　capacity　of　＇point-to-point＇　duplex　data　transmission.　©　(2012)　Trans　Tech　Publications,　Switzerland.