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A communication protocol for MIL-STD-1553B data bus based on the time synchronization is proposed by ECSS，which provides upper layer interface services. Since the commercial 1553B bus simulation software does not supports these upper layer services, it can’t satisfy the bus function test needs of spacecraft applying such protocol The five kinds of services offered by the time synchronization communication protocol are analyzed concretely, and the typical RT action under this protocol is defined. Based on this, the RT simulation demands based on the time synchronization communication protocol is brought up in this article and the bus test software supporting services proposed by the time synchronization communication protocol is designed accordingly by making a secondary development of the commercial software, which provides basic functions such as 1553B bus monitoring, data filing, replaying and data enquiry, as well as RT simulation under the time synchronization communication protocol. This software introduced in this article has been applied in multiple spacecrafts.