A method, an apparatus, and a system for reducing line-to-line crosstalk during transmission of a digital subscriber line service are disclosed, where the method includes: before a service is provisioned, obtaining, by a service provider according to a service transmission rate and a topology scenario parameter that are provided by a service receiving side device, a power spectral density of a line in a process of receiving a service by the service receiving side device; and provisioning, by the service provider, a service for the service receiving side device according to the power spectral density.