In an effort to reduce the burgeoning enrollment at its flagship campus, the University of Maryland is considering a new admissions policy to make it more difficult to gain admission to College Part campus.

If approved, the plan would end the traditional policy of uniform admissions standards at the three undergraduate campuses.

The plan was drafted after university officials were forced to use stopgap measures this year to begin enrollment cutbacks at the College Park sacpus, which has a current enrollment of 37,000 students.

One point in favor of the plan is a recent study which found that 13 percent of the freshmen enrolled at College Park last fall lacked minimum academic qualifications, apparently indicating that standards are too lenient.

Opponents of the proposal, however, have raised fears that the university's underenrolled campuses in Baltimore County and on the Eastern Shore would suffer the stigma of a "second class" image if the plan were approved.

A new master plan approved by the state Board for Higher Education last month calls for the College Park campus to be more selective in order to "increase retention rates and attractiveness to high ability students."

That plan also calls for a decline in the number of incoming freshmen at College Park from last fall's 5,500 to 4,000 in 1983.