here is the link for your question this will help you
$().SPServices.SPFilterDropdown({
relationshipWebURL: "",
relationshipList: "",
relationshipListColumn: "",
relationshipListSortAscending: true,
relationshipListSortColumn: "",
columnName: "",
listName: $().SPServices.SPListNameFromUrl(),
promptText: "",
noneText: "(None)",
CAMLQuery: "",
CAMLQueryOptions: "<QueryOptions></QueryOptions>",
completefunc: null,
debug: false
});