采用高温高剪切仪和超声波剪切仪对OCP粘度指数改进剂的剪切安定性能进行了测试,并将分析结果与粘度指数改进剂的分子结构进行了关联,发现随着分子量的增加,剪切安定性能下降,随着分子量分布增宽和高分子链中丙基序列的增加,高温高剪切条件下的剪切安定性能下降,而超声波剪切条件下的剪切安定性能增加.从高分子的立体化学结构层次进行了结构与性能关系的分析. The shear stability of OCP viscosity modifier was tested by high temperature high shear and ultrasonic shearing instrument. The results were correlated with the molecular structure of viscosity index improver. It was found that with the increase of molecular weight, Shear stability deteriorated with the broadening of the molecular weight distribution and the increase of the propyl sequence in the polymer chain. The shearing stability under high temperature and high shear conditions decreased, while the shear stability under ultrasonic shear condition increased. Molecular structure of the three-dimensional chemical structure and performance of the relationship analysis.