Magento中，Group Product可以上传图片，但是他下面list的产品没有图片，那如何为这些list添加图片呢，其实很简单的：

找到grouped.phtml，路径 

web_root/app/design/frontend/base/default/template/catalog/product/view/type

Replace 

<thead>
	<tr>
		<th><?php echo $this->__('Product Name') ?></th>
		<th class="a-right"><?php echo $this->__('Price') ?></th>
		<?php if ($_product->isSaleable()): ?>
		<th class="a-center"><?php echo $this->__('Qty') ?></th>
		<?php endif; ?>
	</tr>
</thead>
to 
<thead>
	<tr>
		<th><?php echo $this->__('Image') ?></th>
		<th><?php echo $this->__('Product Name') ?></th>
		<th class="a-right"><?php echo $this->__('Price') ?></th>
		<?php if ($_product->isSaleable()): ?>
		<th class="a-center"><?php echo $this->__('Qty') ?></th>
		<?php endif; ?>
	</tr>
</thead>

and then, replace 

<tr>
	<td><?php echo $this->htmlEscape($_item->getName()) ?></td>
	<td class="a-right">
		<?php echo $this->getPriceHtml($_item, true) ?>
		<?php echo $this->getTierPriceHtml($_item) ?>
	</td>
	<?php if ($_product->isSaleable()): ?>
	<td class="a-center">
		<?php if ($_item->isSaleable()) : ?>
			<input type="text" name="super_group[<?php echo $_item->getId() ?>]" maxlength="12" value="<?php echo $_item->getQty()*1 ?>" title="<?php echo $this->__('Qty') ?>" class="input-text qty" />
			<?php else: ?>
				<p class="availability out-of-stock"><span><?php echo $this->__('Out of stock') ?></span></p>
			<?php endif; ?>
	</td>
	<?php endif; ?>
</tr>
to 
<tr>
	<td><?php echo '<img src="'.$this->helper('catalog/image')->init($_item, 'thumbnail')->resize(40, 40).'" width="40">'; ?></td>
	<td><?php echo $this->htmlEscape($_item->getName()) ?></td>
	<td class="a-right">
		<?php echo $this->getPriceHtml($_item, true) ?>
		<?php echo $this->getTierPriceHtml($_item) ?>
	</td>
	<?php if ($_product->isSaleable()): ?>
	<td class="a-center">
		<?php if ($_item->isSaleable()) : ?>
			<input type="text" name="super_group[<?php echo $_item->getId() ?>]" maxlength="12" value="<?php echo $_item->getQty()*1 ?>" title="<?php echo $this->__('Qty') ?>" class="input-text qty" />
			<?php else: ?>
				<p class="availability out-of-stock"><span><?php echo $this->__('Out of stock') ?></span></p>
			<?php endif; ?>
	</td>
	<?php endif; ?>
</tr>

Done!