PSG was without Neymar, Edinson Cavani and Kylian Mbappe, but still had little difficulty against its opponent.
The Ligue 1 giant was far from its vibrant best without the injured trio, but did enough to claim a routine win over a side that hardly threatened, with second-half goals from Di Maria and Christopher Nkunku proving decisive.
Given the fact PSG was without the sources of 53 of its Ligue 1 goals this season, it was hardly surprising to see it struggle as an attacking force in the first half, with Troyes goalkeeper Erwin Zelazny mostly kept busy by long-range attempts.
But a fine Di Maria effort early in the second half, his seventh goal in six games across all competitions, ended Troyes's dogged resistance.
The home side failed to offer much of a response, Alphonse Areola in the PSG goal enjoying a leisurely outing.
PSG ultimately cruised to all three points thanks to Nkunku's late effort, taking it into Wednesday's (AEDT) crunch UEFA Champions League return tie at home to Real Madrid in winning form.
PSG established control early on and went close to the opener in the seventh minute, but Di Maria's effort was repelled by Zelazny after Julian Draxler had raced on to Giovani Lo Celso's through pass and teed up the former Manchester United man.
Aside from that opportunity, PSG's lack of Neymar, Cavani and Mbappe was telling during the early exchanges, as their replacements showed little sign of being on the same wavelength and clear-cut chances failed to flow.
The visitors only looked like troubling Troyes from distance, but did force Zelazny into a couple of saves, with Lo Celso and then Di Maria testing the goalkeeper.
PSG was a little more vibrant and fluid towards the end of the half. However, Zelazny continued to come out on top, keeping another long-range Lo Celso attempt at bay, before producing a fine reaction save to thwart a Nkunku overhead-kick.
Zelazny was eventually beaten just after the break, Di Maria racing on to Draxler's pass and lifting a clever chipped effort over the approaching goalkeeper.
Nkunku should have doubled their lead soon after, but he inexplicably shot wide of the right-hand post from about eight yards after a sensational run and pass from Draxler.
But the young attacker made amends for that miss 13 minutes from time, providing a neat finish from close range.
Things got worse for Troyes soon after, as Jean-Louis Garcia was sent to the stands for his protestations, but PSG, which introduced George Weah's 18-year-old son Timothy for a debut late on, was unable to add further gloss to the scoreline, Dani Alves seeing an stoppage-time strike ruled out for offside.