Taking the four-leg lunar lander as the study object, the lander's component structure and lunar physical attribute was analyzed. When studying the lander's dynamics, a block parameter simulation method based on structure was proposed, which analyzes the lander's dynamic behavior during the landing moment, derives the buffers' and foot pads' dynamic model individually and integrates each model through simplifying lander's structure. Technology of visual simulation was introduced and simulation of lunar-landing was realized. The effects of different initial conditions, such as slop of lunar surface and lading velocity, stiffness coefficient and damping coefficient were measured through simulation. The result verifies the validity of the method. This method has already successfully applied in engineering research of lunar-landing.
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