this->tableView->horizontalHeader()->setStyleSheet("QHeaderView::section {background-color:darkcyan;"
                                                       "color: black;padding-left: 4px;border: 1px solid #6c6c6c;}");

this->tableView->verticalHeader()->setStyleSheet("QHeaderView::section {background-color:darkcyan;"
                                                     "color: black;padding-left: 4px;border: 1px solid #6c6c6c;}");

以下好看的樣式來自于http://blog.csdn.net/zenwanxin/article/details/6524559

tableView->horizontalHeader()->setStyleSheet

("QHeaderView::section {background-color: qlineargradient(x1:0, y1:0, x2:0, y2:1,"

"stop:0 #616161, stop: 0.5 yellow,stop: 0.6 green, stop:1 cyan);"
"color: white;padding-left: 4px;border: 1px solid #6c6c6c;}"
"QHeaderView::section:checked{background-color: red;}"
"QHeaderView::down-arrow {image: url(down_arrow.png);}"
"QHeaderView::up-arrow {image: url(up_arrow.png);}");