In order to satisfy both cushioning and fast-extension performances， the carrier aircraft nose landing gear often adopts the dual-chamber buffer design. Based on a certain type nose landing gear， this paper establishes the dynamic model of the cushion? ing performance analysis and compares the simulation calculation results with the test results to ensure the validity and correctness of the theoretical dynamic model. The parameter sensitivity analysis of cushioning performance is carried out for the initial filling pressure and volume ratio of the high- and low-pressure chambers of the buffer. Results show that the effects of the initial filling pressure and high- and low-pressure chambers volume ratios on the cushioning performance is different from their impacts on the fast-extension performance. Therefore， the design of the nose landing gear buffer of the carrier aircraft needs to be continuously op? timized for taking the cushioning and fast-extension performances into account synchronously.