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With the increasing importance of energy conservation emission reduction, the research about how to improve the operating efficiency of asynchronous motor has become a hot topic in the field of high-performance transmission. Among many efficiency optimization algorithms, the control method based on loss model (LMC) is widely concerned because of its clear physical meaning and fast optimization speed. The core of LMC is to ensure that the instruction of optimized flux can be accurately controlled which can realize the complete decoupling of the torque and flux in the FOC. Based on the model of asynchronous motor considering iron loss, the paper deduces the flux expression of asynchronous motor and proposes an improved flux observer. Finally, the feasibility and effectiveness of the proposed control strategy are verified by simulation and experiment.