中文摘要：

针对在滑轮组运动分析中存在的一些误区，根据动滑轮和定滑轮的运动特点，研究了双滑轮运动的常见误区和问题所在，即双滑轮中连在同一根绳子上的物体加速度大小并不都相等，在分析时应附加上动滑轮本身平动的加速度，并运用相对性原理提出了一种新的解决方案．

英文摘要：

Pulley systems are widely used in the project~ however, there are often some misunderstandings to movement analysis of pulleys. According to the kinematics character of the fixed pulley and movable block, we examine those common misunderstandings and problems in the double pulley, and puts forward a new solution using the principle of relativity. It is found that the object acceleration in the same string are not equal, the analysis should be attached on the acceleration of movable block itself.