This　paper　considers　the　consensus　behavior　of　a　spatially　distributed　3-D　dynamical　network　composed　of　heterogeneous　agents:　leaders　and　followers,　in　which　the　leaders　have　the　preferred　information　about　the　destination,　while　the　followers　do　not　have.　All　followers　move　in　a　3-D　Euclidean　space　with　a　given　speed　and　with　their　headings　updated　according　to　the　average　velocity　of　the　corresponding　neighbors.　Compared　with　the　2-D　model,　a　key　point　lies　in　how　to　analyze　the　dynamical　behavior　of　a　＂linear＂　nonhomogeneous　equation　where　the　nonhomogeneous　term　strongly　nonlinearly　depends　on　the　states　of　all　agents.　Using　the　network　structure　and　the　estimation　of　some　characteristics　for　the　initial　states,　we　present　a　proper　decaying　rate　for　the　nonhomogeneous　term　and　then　establish　lower　bounds　on　the　ratio　of　the　number　of　leaders　to　the　number　of　followers　that　is　needed　for　the　expected　consensus　by　considering　two　cases:　1)　fixed　speed　and　neighborhood　radius　and　2)　variable　speed　and　neighborhood　radius　with　respect　to　the　population　size.　Some　simulation　examples　are　given　to　justify　the　theoretical　results.