has体现三单,故借助助动词does
He doesn't have to do his homework at school.He have not do his homework at school ������ô���£�����have/has表示“有”时，或者在现在完成时“have/has+过去分词”结构中的have/has才是助动词，其余情况下常作实义动词，故需要借助助动词帮助否定。你的这个句子表达是错误的。