尝试使用
line-height:35px
<table>
<tr>
<td valign="top" align="center">
<span style="color: black; text-align: center; text-transform: uppercase; font-weight:100 !important; letter-spacing: 8px; font-size: 35px;font-family: 'open sans', arial, sans-serif; line-height:35px;">TIECON</span>
</td>
</tr>
<tr>
<td valign="top" align="center">
<span style="color: black; text-align: center; text-transform: uppercase; font-weight:100 !important; letter-spacing: 8px; font-size: 35px;font-family: 'open sans', arial, sans-serif;line-height:35px;">AHMEDABAD</span>
</td>
</tr>
<tr>
<td valign="top" align="center">
<span style="color: black; text-align: center; text-transform: uppercase; font-weight:100 !important; letter-spacing: 8px; font-size: 35px;font-family: 'open sans', arial, sans-serif;line-height:35px;">2016</span>
</td>
</tr>
</table>