Jamie Carpenter hammered 132 and Michael Yardy 94 as Sussex Seconds declared on 381-7 to set Kent 360 to win at Hastings.
Pace bowler Paul Havell struck an early blow by bowling Richard Clinton for one as the visitors closed on 1-1.
Sussex resumed on 14-0 and Carpenter had smashed 15 fours and two sixes off 230 balls when he was seventh out immediately before the declaration.
Carpenter, who skied Richard Furley to long off, shared in half century stands with Will House (38) and Justin Bates (32) after putting on 88 for the third wicket with Yardy.
Yardy struck 11 boundaries off 199 deliveries and narrowly missed out on his century when trapped leg before by James Treadwell.
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