Web Server is a software technology and communication method to carry out information issuance. The new concept of combination of equipment faults diagnoses with Web Services technology is proposed. The techniques flow of equipment, techniques parameters, signal characteristics and inference resolution in faults diagnoses are put forward with communication and software in order to carry out data dynamical exchange and interface of HMI. The remote processing on network of system information issuance is formed in this way. The principle and characteristics of Web Server technology are introduced. The common contents of information issuance in on line diagnoses system is also classified. The Web Server is applied in the project for high technology research work (863 project) "Remote and Intelligent On-line Diagnoses System for Rotational Machinery" to realize the function of information issuance and data inquire by groupware of DELPHI 6 Web Services.