1, the archiving principle is different. Traditional volunteering is "from high score to low score according to volunteering", while parallel volunteer is "scoring first, then volunteering".

2. The number of volunteers is different. There is only one parallel college volunteer in parallel volunteer (but it contains professional information of three parallel colleges and ABC), while traditional volunteers have several volunteers submitted in turn.

3. Compared with the traditional volunteering, it reduces the risk of filing in parallel volunteer, increases the chances of candidates being filed, reduces the phenomenon of high scores falling out of the list, reduces the phenomenon of file breakage in colleges and universities, and improves the matching degree between candidates' volunteering and college selection plans.

There are three colleges and universities in parallel volunteer, which means that candidates can fill in three parallel colleges and universities A, B and C as their first choice. When searching by computer, we should first sort the candidates' scores, regardless of institutions, and then search by computer in the sorted order, that is, follow the principle of "score first".

When collecting candidates' volunteers, the computer also analyzes and judges whether the number of pre-investment files reported by the candidates in ABC's three voluntary colleges has reached the upper limit of the number of files that should be invested. The judgment results can be divided into the following three types, which are treated as follows:

1. If there are more than one institution among the institutions reported by the candidates, the candidates' files will be pre-submitted to the top ranked institutions in ABC order, that is, for the candidates, their volunteering is in order. When the conditions of filing in many colleges and universities are met, the computer association will pre-file the files in the first voluntary college, which embodies the principle of "following the wishes";

2. If only one of the colleges and universities is not full, the candidates' files will be pre-invested in the college;

3. If the number of candidates in all colleges and universities reaches or exceeds the number of files they should file, they can't file and can only participate in the solicitation of volunteers.