
PSG have 37 points after 15 matches, seven ahead of Olympique Marseille in second. Lyon are fifth with 25 points.
The capital club opened the scoring after eight minutes when Desire Doue made a brilliant run and cut the ball back to Dembele, who slotted home with a composed finish.
The hosts doubled the lead after 14 minutes when Corentin Tolisso fouled Doue and Vitinha converted the penalty.
However, Lyon’s Georges Mikautadze pulled one back five minutes before the break, latching onto a brilliant pass and calmly chipping into the net from inside the box.
The second half lacked the same excitement but Ramos put the finishing touch to PSG’s victory with their third two minutes from time soon after being brought on as a substitute.