Chichester scored straight from kick-off as they maintained their grip on the title race.
Paul Thomas crossed and Scott Murfin finished before visitors Pagham had even touched the ball.
It finished 4-1 as Jamie Laidlaw added a hat-trick and James Mandry replied.
The result keeps Chi six points clear ahead of next week's crunch division one home clash with Eastbourne Town.
Boss Adie Girdler said: "We've got a hard month ahead of us but this result was doubly pleasing being a local derby."
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