select * from activity
order by
case when activityname= '一' then '1'
when activityname= '二' then '2'
when activityname= '三' then '3'
when activityname= '四' then '4'
when activityname= '五' then '5'
when activityname= '六' then '6'
when activityname= '七' then '7'
end