Applying glue system of medium density fiberboard is a typical nonlinear time-delay system.In this paper,based on the simple introduction of the principle of the inverse model identification,using the function approximation ability of support vector machine,the inverse model of applying glue system is identified with the direct inverse model identification method based on least squares support vector regression,and the simulation results indicate that the inverse model of applying glue system built through the direct inverse model identification method on support vector machine has high accuracy and the feasibility and validity of the method is also proved.