Over the coming months, ducts and a drainage system will be installed and the base layers will be laid in preparation for the turf and track next year.
The black and white seats that will furnish the stadium have also gone into production in a factory in Luton and will start to be fitted into the Stadium later this summer.
"The Olympic Stadium will be at the heart of the action in 2012 and its image will be beamed to billions of people across the world," said Olympic Delivery Authority Chairman John Armitt.
"Only two years ago, the Stadium site was a flat piece of ground. A huge amount has been achieved since then with the venue now structurally complete and at its full height. Work is progressing on covering the roof and the first seats will be fitted this summer. The continuing progress means the Stadium is still on track to be completed a whole year before the London 2012 Games."
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