GLENEAGLES, SCOTLAND, Aug 26, 2012 (AFP) - Lawrie, 43, shot a final round 68 for a 16-under par total of 272 in his second Tour victory this year and the eighth of his career.
Australia's Brett Rumford secured his best finish in two years shooting a 68 for second place on 12-under par on the PGA Centenary course at Gleneagles.
Holland's Maarten Lafeber (69), France's Romain Wattel (72) and Sweden's Fredrik Anderssen-Hed (65) shared third place on 11-under par.
Lawrie was delivering a further boost to Jose Maria Olazabal's European team as this success came on the back of wins this month by fellow Ryder Cup team members Rory McIlroy in the PGA Championship and Sergio Garcia in the Wyndham Championship.
Lawrie made his Ryder Cup debut and 13 years on he will travel with Olazabal's team later next month to Medinah as the oldest member of the European Team
"It feels pretty good to be Johnnie Walker champion and it's been probably one of the best ball-striking weeks of my career," he said.
"But then I putted pretty poorly and shot four under shows just how well I have been striking the ball and I've also been hitting a bit longer this week and that has helped."
Lawrie's winner's cheque saw him move from fourth to be officially confirmed as the third place European qualifier for the Ryder Cup.
"Confidence-wise the last six weeks have not been easy and I have not played as well as I did at the start of the year," said Lawrie.
"But by getting the Ryder Cup situation out of the way I have played really well and won the tournament, and if you are not going to be the most confident golfing going to the Ryder Cup you are going to struggle.
"However Rory (McIlroy) winning the PGA Championship is a huge lift for the team and for a European to win the last Major is massive.
"So I will be going to my second Ryder Cup playing nicely and hitting it lovely and I'm looking forward to it."
Lawrie is scheduled to contest the next two events, the European Masters and KLM Open as well as hosting the Paul Lawrie Invitational at Deeside, a Scottish Tour event, in the week before the Ryder Cup.
And delighted to be returning to the European Ryder Cup team, Lawrie will target finishing the second a career best of inside the top-five on the Race to Dubai money list.
His Gleneagles victory lifted him up five places to seventh.
"Once I was confirmed for the Ryder Cup team my goal was to finish top-five in the Race to Dubai and any time you win a tournament this late in the year you are going to have a chance to jump up the money list," he said.
"So this is a huge win for me in that regard and to do it in front of my home crowd is very satisfying."
Fourth-round scores in the EPGA Johnnie Walker Championship at Gleneagles on Sunday (GBR/IRL unless stated, par 72):
272 - Paul Lawrie 68 69 67 68
276 - Brett Rumford (AUS) 67 70 71 68
277 - Romain Wattel (FRA) 74 68 63 72, Maarten Lafeber (NED) 68 73 67 69, Fredrik Andersson Hed (SWE) 73 69 70 65
278 - Francesco Molinari (ITA) 68 72 71 67, Richie Ramsay 69 71 70 68, Stephen Gallacher 75 67 65 71, Colin Montgomerie 72 68 69 69
279 - Peter Whiteford 72 69 71 67, Thomas Bjorn (DEN) 70 71 68 70, Paul Waring 71 67 72 69, Rafael Cabrera Bello (ESP) 72 68 69 70
280 - Craig Lee 70 73 70 67
281 - Anders Hansen (DEN) 72 72 71 66, Thorbjorn Olesen (DEN) 68 72 69 72, Gregory Bourdy (FRA) 72 66 71 72, Victor Dubuisson (FRA) 69 72 71 69
282 - Gary Boyd 74 70 64 74, Richard Finch 69 67 78 68, Nicolas Colsaerts (BEL) 69 70 71 72, Jorge Campillo (ESP) 73 68 70 71, Marcel Siem (GER) 75 69 71 67, Edouard Dubois (FRA) 71 70 71 70, James Morrison 71 71 72 68
283 - Ricardo Gonzalez (ARG) 71 69 76 67, Chris Wood 70 70 75 68, Alexander Noren (SWE) 72 69 70 72, Mark Foster 68 68 75 72, David Lynn 71 70 73 69, Christopher Doak 76 66 69 72
284 - Ross Fisher 76 68 71 69, Knut Borsheim (NOR) 67 73 69 75, David Howell 70 69 71 74, Rhys Davies 72 68 75 69, Pablo Larrazabal (ESP) 75 67 73 69
285 - Tjaart Van Der Walt (RSA) 73 70 71 71, Fabrizio Zanotti (PAR) 73 71 70 71, Scott Pinckney (USA) 72 70 69 74
286 - Matthew Nixon 71 69 72 74, Matthew Southgate 73 67 72 74, Lloyd Saltman 77 67 71 71
287 - Emiliano Grillo (ARG) 71 71 77 68, Robert Coles 72 71 71 73, Tommy Fleetwood 71 70 73 73, Simon Thornton 75 69 71 72, Bradley Dredge 71 73 70 73, Scott Jamieson 76 68 73 70
288 - David Dixon 75 69 72 72
289 - Andrew Marshall 71 73 74 71
290 - Damien McGrane 73 71 73 73, Stephen Dodd 73 68 74 75, Peter Lawrie 72 72 76 70
291 - Chris Gane 70 73 74 74, Gary Orr 74 67 73 77, Joel Sjoholm (SWE) 72 71 74 74, Daniel Gaunt (AUS) 70 73 72 76, Victor Riu (FRA) 74 70 73 74, Johan Edfors (SWE) 71 72 73 75
292 - Shiv Kapur (IND) 72 72 74 74, Richard McEvoy 72 72 76 72, Oliver Fisher 73 70 75 74
293 - Benjamin Hebert (FRA) 70 73 72 78, Jose Manuel Lara (ESP) 72 71 79 71
294 - Lloyd Kennedy 70 72 77 75
296 - Alex Haindl (RSA) 72 72 80 72
303 - Markus Brier (Aut) 73 71 81 78