为了使值班人员及每天班次可自定义，所以做得公式比较麻烦，不过一劳永逸吧，我自己也能用得到，发给你看看。
值班人员如果增加，可以直接在下面增加人员，排班表自己调整，如果要增加每天的值班人的话，需要增加列，并调整公式参数。
C列（人员1）内单元格公式：
=INDEX($G$2:$G$32,IF((ROUNDDOWN((COUNTA($C$1:$E$1)*$A2-2)/COUNTA($G$2:$G$32),8)-ROUNDDOWN((COUNTA($C$1:$E$1)*$A2-2)/COUNTA($G$2:$G$32),0))=0,COUNTA($G$2:$G$32),(ROUNDDOWN((COUNTA($C$1:$E$1)*$A2-2)/COUNTA($G$2:$G$32),8)-ROUNDDOWN((COUNTA($C$1:$E$1)*$A2-2)/COUNTA($G$2:$G$32),0))*COUNTA($G$2:$G$32)))
D列（人员2）内单元格公式：
=INDEX($G$2:$G$32,IF((ROUNDDOWN((COUNTA($C$1:$E$1)*$A2-1)/COUNTA($G$2:$G$32),8)-ROUNDDOWN((COUNTA($C$1:$E$1)*$A2-1)/COUNTA($G$2:$G$32),0))=0,COUNTA($G$2:$G$32),(ROUNDDOWN((COUNTA($C$1:$E$1)*$A2-1)/COUNTA($G$2:$G$32),8)-ROUNDDOWN((COUNTA($C$1:$E$1)*$A2-1)/COUNTA($G$2:$G$32),0))*COUNTA($G$2:$G$32)))
E列（人员3）内单元格公式：
=INDEX($G$2:$G$32,IF((ROUNDDOWN((COUNTA($C$1:$E$1)*$A2)/COUNTA($G$2:$G$32),8)-ROUNDDOWN((COUNTA($C$1:$E$1)*$A2)/COUNTA($G$2:$G$32),0))=0,COUNTA($G$2:$G$32),(ROUNDDOWN((COUNTA($C$1:$E$1)*$A2)/COUNTA($G$2:$G$32),8)-ROUNDDOWN((COUNTA($C$1:$E$1)*$A2)/COUNTA($G$2:$G$32),0))*COUNTA($G$2:$G$32)))