It consists of a citizen's identity number or a personal identity type code and a self-code.

1. Personal identity self-coding refers to the educational identity number given to the educated individual by the Ministry of Education according to these rules when the educated individual has no citizenship number or the original citizenship number is unavailable.

2. Personal identity self-coding is a kind of characteristic combination code, which consists of 17 digital ontology code and check code.

3. From left to right are six-digit address code, eight-digit date of birth code, three-digit serial code and one-digit check code.