The keicho was organized for each province and was a basic ledger to levy duties, including Soyocho (a tax system, corvee), Yo (Labor or alternative goods), zoyo (irregular corvee) and military service.
国ごとにまとめられて租庸調（ちょう）・庸（よう）・雑徭（ぞうよう）、軍役など、課役賦課の基本台帳とされた。