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An innovative multilevel read-only recording method is proposed.In this method,a short pit/land is deliberately inserted to the original land/pit.This modifies the wave-shape of readout signal.Taking the wave-shape as the symbol of level detection,a signal wave-shape modulation (SWSM) multilevel method is realized.This method is carried out and validated on the DVD read-only manufacture and readout system.A capacity of 15 GB can be expected,and a bit error rate of 10-4 is achieved.The capacity can meet the demand of high definition movie publication.This method also provides a potential multi-level solution for other storage formats and systems.