BEIJING, July 2 (Xinhua) -- China's Ministry of Education urged reasonable assignments of homework for primary and secondary school students during summer vacation to reduce their extracurricular burdens.

This is to ensure that they will have a "safe, happy and meaningful vacation," the ministry said in a statement Tuesday.

Schools should control the quantity of assignments and parents should be advised not to arrange excessive after-school training for their children, the statement said.

Regulation on extracurricular class institutions should also be tightened.

Any sessions exceeding the standard amount or content should be rectified in a timely manner, and institutions failing or refusing to do so will be punished. In serious cases, their training licenses will be revoked, the statement said.