The NPC selection committee will vote twice to choose the 36 deputies if there are more than 48 candidates.
The committee, comprising more than 400 people, will first vote to cut the number of candidates to not more than 48 - the maximum allowed by NPC election law. It will be a secret ballot.
Voters can choose up to 36 candidates each. The winners are those with the most votes. The system is the same as that used for the selection of the provisional legislature late last year.
Candidates must have the support of at least 10 voters to qualify.
It is estimated about 420 people would qualify to become voters in the NPC race.
In March, the NPC plenum decided the selection committee would be composed of Chinese nationals from the 400-strong Selection Committee, formed in late 1996 to choose the Chief Executive and provisional legislature members.