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cooperative work manner for a group of people making use of network.Nowadays，it is a study hotspot in and out country，but the contents are usually idiographic applications，lacking in security researches.Because CSCW is based upon network environment，and is full of hazardous securlty factors.so it is very necessary to enhance security study.Digital Signature is all important part of information security system，which uppermost application area is identity authentication.Aims at the above disadvantage，a discussion in detail is put forward in the paper，namely utilizing digital signature technique to make the CSCW system run safely combining with some of applications in CSCW like electronic commerce and military affairs.