Canterbury - Kent were 203 for five in reply to Australia's first innings 507 for eight declared, a deficit of 304 runs, at stumps on the second day of their four-day match at Canterbury on Friday.
Sam Billings was 24 not out and Adam Ball 21 not out.
Left-arm fast bowler Mitchell Johnson led Australia's attack with three wickets for 42 runs in 13 overs.
This is the first official match of Australia's 2015 Ashes tour.
The scoreboard at stumps:
Australia 1st innings (overnight: 348-3)
C. Rogers lbw b Hunn 84
S. Marsh c Bell-Drummond b Hunn 114
S. Smith retired out 111
M. Clarke c Billings b Hunn 56
S. Watson c Denly b Hunn 21
M. Marsh b Hunn 30
B. Haddin c Ball b Riley 35
M. Johnson not out 32
R. Harris c Billings b Ball 9
Extras (lb10, w2, nb3) 15
Total (8 wkts dec, 124.4 overs) 507
Did not bat: P Siddle, F Ahmed
Fall of wickets: 1-181 (Rogers), 2-242 (S Marsh), 3-337 (Clarke), 4-398 (Smith), 5-419 (Watson), 6-438 (M Marsh), 7-498 (Haddin)
Bowling: Thomas 26-2-104-0; Claydon 29-6-111-0 (1nb); Hunn 27-3-99-5 (1nb); Ball 16.4-0-87-1 (1nb, 2w); Riley 26-3-96-1;
Kent 1st innings:
D. Bell-Drummond lbw b Johnson 0
J. Denly c Haddin b Siddle 36
R. Key c S Marsh b Ahmed 87
S. Northeast c Haddin b Johnson 25
B. Harmison b Johnson 5
S. Billings not out 24
A. Ball not out 21
Extras (lb1, nb4) 5
Total (5 wkts, 53 overs) 203
To bat: M Claydon, M Hunn, A Riley, I Thomas
Fall of wickets: 1-0 (Bell-Drummond), 2-81 (Denly), 3-140 (Northeast), 4-152 (Key), 5-168 (B Harmison)
Bowling: Johnson 13-3-42-3 (1nb); Harris 11-0-39-0; Siddle 11-2-32-1 (2nb); Ahmed 11-1-59-1; M Marsh 6-1-29-0 (1nb); Smith 1-0-1-0
Match position: Kent are 304 runs behind with five first-innings wickets standing.
Umpires: Ben Debenham (ENG), Nigel Llong (ENG).