The defending NFL champion Dolphins, representing the AFC for the third straight year, scored the first two times they had possession on marches of 62 and 56 yards while the Miami defense limited the Vikings to only seven plays in the first period.
Larry Csonka climaxed the initial 10-play drive with a 5-yard touchdown bolt through right guard after 5:27 had elapsed. Four plays later, Miami began another 10-play scoring drive, which ended with Jim Kiick bursting one yard through the middle for another touchdown after 13:38 of the period.
Garo Yepremian added a 28-yard field goal midway in the second period for a 17-0 Miami lead.
Minnesota then drove from its 20 to a second-and-2 situation on the Miami seven yard line with 1:18 left in the half. But on two plays, Miami limited Oscar Reed to 1 yard.
On fourth-and-1 from the 6, Reed went over right tackle, but Dolphins middle linebacker Nick Buoniconti jarred the ball loose and Jake Scott recovered for Miami to halt the Minnesota threat.
The Vikings were unable to muster enough offense in the second half to threaten the Dolphins.
Csonka rushed 33 times for a Super Bowl-record 145 yards.
Bob Griese of Miami completed 6 of 7 passes for 73 yards.