Yunlu Technology completely independently developed a multi-physics simulation platform including analysis of structures, fluids, electromagnetism, heat transfer, etc. The capability in simulation and analysis is comparable to internationally renowned software. It can perform a large-scale numerical simulation with multiple fields (10+), mutiple domains, multiple scales. We overcome the defects, which that well-known general software faced, of coupling analysis with multi-modules and interacting data difficultly. From the mathematical theory of multi-physics partial differential equations, based on an unified data structure, we combine data from various physical fields tightly, make coupling boundary conditions link automatically. We break through the blockade of parallel techniques. Based on Domain Decomposition Method (DDM), we design and modify the algorithm. The degree of code parallelism reaches up to 95%, and the efficiency of parallelism is better than other domestic and international commercial software.