Thanks for the advices! Finally I solved my former request by adding another <TMPL_VAR> to describe color in the loop. So the color will be changed automatically for each case.

<TMPL_LOOP NAME=TC_Loop>
  <tr>
    <td><TMPL_VAR NAME=TC_Num></td>
    <td style="color:DarkSlateGray "><TMPL_VAR NAME=TC_Name></td>
    <td style=<TMPL_VAR NAME=TC_Rst_Color>><TMPL_VAR NAME=TC_Rst></td>
    <td style=<TMPL_VAR NAME=TC_Rst_Color>><TMPL_VAR NAME=TC_Time></td
+>
    <td ><a href=<TMPL_VAR NAME=TC_Ref>>ExpandRef</a></td>
 </tr>
</TMPL_LOOP>
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