The tipover of scissor lift in operation has 〖JP2〗frequently resulted in the severe injures of workers, so it is indispensable to research the tipover stability of scissor lift. The objective of this study was to calculate the tipover threshold theoretically and to simulate based on ADAMS for different possible tipover scenarios during the process of operations, and the comparative analyses between theoretical results and simulation were conducted. The analyses show that the error rate is less than 1%, and the accuracy of the simulation is also verified. The drop tests of worker in different anchorage points of the rope were simulated in ADAMS, according to the clearance between wheels and the ground, the most dangerous anchorage point was obtained as shown in point 2. Finally, the factors which have influences on scissor lift tipover stability were analyzed for different scenarios. The results show that larger tread can improve the lateral tipover stability of scissor lift; the center of gravity of scissor lift is rising gradually and moving to the left, which can lead to the decline of stability; the impact to scissor lift is different when the locations of the rope change, which will result in different tipover situations.