A measurement method using a synchronization signal block, a terminal device, and a base station. In the method, a terminal device can determine a first adjustment parameter of a to-be-measured neighboring cell, and determine, based on the first adjustment parameter, a first synchronization signal block-based measurement timing configuration SMTC window corresponding to the to-be-measured neighboring cell. Then, the terminal device measures the to-be-measured neighboring cell based on the first SMTC window.