The Chinese Mandarin Mobile Speech Recognition Corpus was collected in China. It contains the voices of 265 different speakers (134 males, 131 females) who were balanced distributed in age (mainly 16 – 30, 31 – 45, 46+ ), gender and regional accents (for the details, please see the technical document). The script contains 7,606(approx.) utterances in total (for more details of script structure design, please check the specification), specially designed to provide materials for both training and testing of many classes of speech recognizers. Each speaker was recorded in a quiet office environment. Mobile platform, i.e. IVR was used for speech collection. Each utterance wave was stored in a separate file and uncompressed. Pronunciation lexicon is available. All audio files were manually transcribed and annotated by native transcribers. Details are available with specification.