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Three truncated α-mannanase from Capra hircus lysosomal (chLAMa, chLAMc and chLAMd) was expressed and secreted in Pichia pastoris.The recombinant engineered strain for chLAMc productions was stable, and the maximum yield of it reached 1.9 U mg-1.However, No mannanase activity was detected in supematant of engineered strains GS 115/pPIC9K-chLAMa and GS 115/pPIC9K-chLAMd.chLAMc exhibited an optimal temperature at 55℃ for the 10-min assay at pH 6.0 which is similar pH optima, temperature optima to its full-length protein (chLAM).