The striker, capped 19 times by China, completed a hat-trick of assists in just six minutes on his Spurs debut after entering the arena on the hour.
Summer capture Jonathan Blondel also made his debut after arriving at the club this week - he almost got an assist to his name as well, but Davies lobbed wide after being released by the Belgian youngster.
With Anthony Gardner also back in action after a pre-season niggle, Steve Carr looking sharp again and completing the full 90 minutes and Steffen Iversen taking his goals in style, it should have been all about positives at Palace but there were concerns as well as both Dean Richards and Milenko Acimovic departed early.
The second half's excitement was a contrast to a more dour opening 45 minutes.
Palace could have opened the scoring with just four minutes on the clock. Danny Granville turned inside Carr but stumbled as he bore down on goal and the chance was snuffed out.
It was all Spurs for the next 40 minutes although it was a frustrating case of almost, but not quite as a number of promising moves fell down around the 18-yard line - Carr, again, heavily involved going forward.
We took the lead after 10 minutes with a slick, one-touch passing move on the break. Simon Davies and Darren Anderton exchanged passes, Milenko Acimovic was also involved and the Slovenian provided the key pass to release Iversen who made no mistake from 10 yards.
Dean Richards appeared to still be suffering the effects of an early clash of heads and was replaced after 20 minutes by Anthony Gardner, his first pre-season action.
We had to wait until the half-hour mark for the next strike on goal as Tony Popovic's half-volley flew straight into Lars Hirschfeld's gloves.
Sergei Rebrov's diving header tested Matt Clarke on the slick surface but, more worrying, Acimovic departed a minute before the break, replaced by Jamie Redknapp, and was escorted straight to the dressing room.
The second half exploded into life with three goals in six minutes following Qu Bo's arrival on the hour.
The Chinese star who only arrived at the club on Monday won a penalty after 65 minutes when Danny Butterfield handled his attempted cross, cross superbly for Simon Davies to head home two minutes later and after 71 minutes, cushioned a ball into the path of Steffen Iversen, who curled home from 20 yards.
Iversen was denied a hat-trick by Clarke's acrobatics, Hirschfeld tipped over Butterfield's drive and Clarke saved well again from Redknapp in the closing minutes.
Starting line-ups: Palace: Clarke, Fleming, Granville, Austin, Popovic, Butterfield, Mullins, Rodger (Routledge, 30), Freedman, Adebola, Thomson.
Spurs: Hirschfeld, Carr, Taricco, Bunjevcevic, Doherty (Perry, 45), Richards (Gardner, 21), Anderton, Davies, Acimovic (Redknapp, 44), Rebrov (Qu Bo, 60), Iversen.
Chinese trialist Qu Bo made quite an impression in his first taste of English football at Selhurst Park.