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Superposition coding relaying (SC-relaying) has the merit of high throughput. At the same time, the investigation of diversity-multiplexing tradeoff (DMT) is also particularly useful for the design and analysis of cooperative relaying strategy. In this work, we consider a two-level rate SC-relaying strategy with only destination-to-relay channel state feedback (DR-CSF) under a long term power constraint. For the SC-relaying strategy with DR-CSF, the allocation rules of relay power SNR exponent are obtained firstly. With the power exponent allocation rules, the DMT of additional signal is investigated as well as its optimizing close-form solution.