To solve the problem that single computer simulation is inefficient with the limitation of resource, a distributed EASY5 simulation method based on the grid is provided. Easy5 is schematic-based simulation software which supports multiple dynamic systems simulation. In this paper, based on SOA (Service Oriented Architecture), the components of Easy5 are abstracted as services and published in grid environment. Utilizing the rich resources in grid environment, these abstracted services can be done efficiently, and finally, the goal of efficient distributed simulation can be well reached. By discussing the relevant technologies, abstracting Easy5 components, invoking Easy5 services and simulation optimization, and doing experiment, this paper can prove that the grid technology provides a new solution to the efficient share of simulation resource and has a broad future.