I've resloved.
Right-click the vFabric Hyperic vApp,select "Edit Settings",at "options" tab,select "Advanced",click "properties".
select "vami.netmask0.vFabric_Hyperic_Server",click "Edit",click "Edit",select "static properties",select "External IP Address" in the drop-down list box for the type,Click "OK",then enter the values in the "default value" textbox,such as "255.255.255.0",modify the fallowing key's properties with the same way:
vami.DNS0.vFabric_Hyperic_Server
vami.DNS0.vFabric_vPostgres_DB
vami.gateway0.vFabric_Hyperic_Server
vami.gateway0.vFabric_Hyperic_DB
Maybe there have another easy mothod,if you got it ,sharing......