The parade on October 1 marks the 65th anniversary of the founding of South Korea's armed forces and is held every five years.
Around 11,000 troops will take part along with picks from the South's military arsenal, including tanks, artillery and rockets and a fly-over involving air force helicopters and jet fighters, a ministry official said.
Also on display will be the Hyeonmu 3, an indigenously developed cruise missile that was first deployed on naval destroyers in November last year.
"It is a precision-guided weapon that can identify and strike the office window of the North's command headquarters," ministry spokesman Kim Min-Seok told reporters at the time.
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The North's nuclear test triggered two months of heightened military tensions on the Korean peninsula that witnessed almost daily threats of strikes and counter-strikes.
The tensions have since eased and the two Koreas are currently making progress on resuming a series of suspended cross-border projects and programmes.
"In light of the current situation, a low-key event is more desirable than a large scale parade which is likely to irritate the North," Yang said.
But the event in Seoul will be nowhere near the scale of the mass display of military might the North put on in July to mark the 60th anniversary of the Korean War armistice.