I found the ui:repeat tag and ui:param cant't work,I used this <ui:repeat value="#{params.keySet.toArray()}" var="param"><ui:paramt name="#{param)" value="#{params[param])"/></ui:repeat>,the result is not correct ,but I use this <ui:repeat value="#{params.keySet.toArray()}" var="param"><h:outputText value="#{param}#{params[param])"/></ui:repeat>,the echo is my expected;