China's top legislature has started its bimonthly session, with lawmakers discussing revisions to the draft laws on national defense transportation and film, among others.

The session will run until Saturday.

The draft legislation on national defense transport is being deliberated for the second time.

It covers the use of railways, waterways and air routes for defense purposes.

Also under discussion is a draft law which will require those in the film industry to maintain professional ethics.

This follows a series of scandals involving young actors and directors being busted for drug use the past few years, on top of film distributors and theatres fudging movie sales figures.

The new draft also streamlines requirements for government approvals for film shoots.

The National People's Congress is also mulling the concept of plea bargains in criminal cases, as well as amendments to the Marine Environmental Protection laws, which will hit polluters with stronger penalties.

Lawmakers are also going over the Paris Climate Change agreement for potential ratification ahead of next week's G20 Summit.