1、打开文件PHPExcel\Writer\Excel2007\Chart.php
2、找到函数_writePlotGroup
3、在
foreach($plotSeriesOrder as $plotSeriesIdx => $plotSeriesRef) { 之前添加代码

$colorNDX=array();
$colorNDX[0] = "ff33cc";
$colorNDX[1] = "ffff00";
$colorNDX[2] = "ffc000";
$colorNDX[3] = "00b0f0";
$colorNDX[4] = "ff0000";
$colorNDX[5] = "058beb";
$colorNDX[6] = "06eb6e";
$t =$plotGroup->getPlotValues();

4、找到
$objWriter->startElement('c:dPt'); 修改代码：

if($t[$plotSeriesIdx]->getPointCount()<=7){
            for($ci=0; $ci<7; ++$ci){
              $objWriter->startElement('c:dPt');
                $objWriter->startElement('c:idx');
                  $objWriter->writeAttribute('val', $ci);
                $objWriter->endElement();

                $objWriter->startElement('c:bubble3D');
                  $objWriter->writeAttribute('val', 0);
                $objWriter->endElement();

                $objWriter->startElement('c:spPr');
                  $objWriter->startElement('a:solidFill');
                    $objWriter->startElement('a:srgbClr');
                      $objWriter->writeAttribute('val', $colorNDX[$ci]);
                    $objWriter->endElement();
                  $objWriter->endElement();
                $objWriter->endElement();
              $objWriter->endElement();
            }
          }else{
            $objWriter->startElement('c:dPt');
              $objWriter->startElement('c:idx');
                $objWriter->writeAttribute('val', 3);
              $objWriter->endElement();

              $objWriter->startElement('c:bubble3D');
                $objWriter->writeAttribute('val', 0);
              $objWriter->endElement();

              $objWriter->startElement('c:spPr');
                $objWriter->startElement('a:solidFill');
                  $objWriter->startElement('a:srgbClr');
                    $objWriter->writeAttribute('val', 'FF9900');
                  $objWriter->endElement();
                $objWriter->endElement();
              $objWriter->endElement();
            $objWriter->endElement();
          }

这里由于是自己定制，所以只设定了7个颜色，如果超出这个范围，则用系统自带的来处理!
效果如图所示：
[img][attach]781[/attach][/img]