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This paper comprehensively introduces and analyzes Shamir Secret Sharing, Pedersens Verifiable SecretSharing based on ECC, verifiable secret sharing without a trusted center based on ECC and an ElGamal digital signa-ture scheme based on ECC. Based on the theoretical introduction, an ElGamal_type(t, n) threshold digital signaturescheme Based on ECC is designed. The performance of the scheme is analyzed. And an application based on thescheme is described. In the scheme, a trusted center to deal with the sharing secret is eliminated. No secret communi-cation is required in the signature issuing phase. The scheme is characterized by excellent security as well as high effi-ciency.