Abstract: Time triggered deterministic network is a network that can meet the requirements of high reliability, low latency and high real-time. This paper proposes an improved deterministic network suitable for large-scale and concurrent requests. Two improvements are made on the basis of time-triggered Ethernet (TTE). First, a partition strategy containing message security level control is added and the idea of security middleware is presented. Second, in view of the characteristics of off-line scheduling of time-triggered messages, a transmission strategy based on time scheduling matrix is proposed. The analysis of network data test results shows that the proposed TTE network improvement scheme can meet the needs of high concurrent network and change the small scale of deterministic network.