The invention provides a standard interface method for instrument systems, and belongs to the technical field of computer interfaces. In the method, a standard instrument interface is defined and the instrument functions and the computer interfaces are separated, so that the instrument functions and the computer interfaces can be developed independently, which means the design of the instrument does not rely on a computer interface technique, and that the instrument functions and the computer interfaces are integrated in a loosely-coupled mode so as to interconnect the instrument and the computer. After the new computer interface technique came into being, by adopting the method, instrument manufacturers can easily apply the new computer interface technique to the original instrument equipment without re-designing the whole instrument equipment and re-considering how to integrate the new computer interface technique into the instrument equipment, so that the problem that the development and maintenance of interfaces of the instrument systems are complex and high in cost and other problems are solved, the design cost of the instrument manufacturers is saved, and the method for interconnecting the instruments and the computers is simplified, and the market need is responded more quickly.