RepeatColumns="3" RepeatDirection="Horizontal"

------解决方案--------------------
HTML code

 <asp:Repeater ID="rptPermission" runat="server" OnItemDataBound="rptPermission_ItemDataBound">
                                        <ItemTemplate>
                                            <table class="CheckBox">
                                                <tr style='background-color: <%#((Container.ItemIndex+1)%2==0)?"ControlLight":"#ccc"%>'>
                                                    <td style="width: 20%" valign="middle">
                                                        <asp:Label ID="lbID" runat="server" Text='<%# Bind("ID") %>' Visible="False"></asp:Label>
                                                        <asp:CheckBox ID="cbPermission" runat="server" Style="width: 150px; display: block;"
                                                            Text='<%# Bind("Name") %>' />
                                                    </td>
                                                    <td style="width: 100%" valign="top">
                                                        <asp:CheckBoxList ID="cblPermission" runat="server" AppendDataBoundItems="true" CellPadding="5"
                                                            RepeatColumns="4" RepeatDirection="Horizontal" RepeatLayout="Table">
                                                        </asp:CheckBoxList>
                                                    </td>
                                                </tr>
                                            </table>
                                        </ItemTemplate>
                                    </asp:Repeater>

------解决方案--------------------
探讨

HTML code

 <asp:Repeater ID="rptPermission" runat="server" OnItemDataBound="rptPermission_ItemDataBound">
                                        <ItemTemplate>
                                  ……


------解决方案--------------------
如果是Silverlight 就很布局。。。可惜这y2的asp.net的。。