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We present SELL-CORPUS, a multiple accented speech corpus for L2 English learning in China, aiming at the potential research of multiple accented acoustic model, mispronunciation detection and pronunciation assessment for future nationwide oral English tests. Our corpus contains 31.6 hour speech recordings contributed by 389 volunteer speakers, including 186 males and 203 females. Our corpus covers seven major regional dialects and provides a baseline for Chinese multiple accented automatic speech recognition system. We released our speech corpus to the public for academic research.