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This paper presents a kind of algorithm of multi-watermarking based on improved DCT coefficient quantization. In this scheme, both robust watermarking and fragile watermarking have been embedded. Especially in the fragile watermarking embedding, different quantization intervals have been utilized and random numbers have been added in order to against forgery attack. Experiments' results show that the two kind of watermarking can respectively do their work well by proper control. By the extraction, we can get the two kind of watermarkings , the one of them can not only be used to estimate the watermarked signal's origination, but also to against the forgery attack, the other one is robust against various signal processing such as noise adding, low pass filtering, re-sampling and so on.