  Quantum key distribution (QKD) holds the potential to establish secure keys
over long distances. The distance of point-to-point QKD secure key distribution
is primarily impeded by the transmission loss inherent to the channel. In the
quest to realize a large-scale quantum network, increasing the QKD distance
under current technology is of great research interest. Here we adopt the
3-intensity sending-or-not-sending twin-field QKD (TF-QKD) protocol with the
actively-odd-parity-pairing method. The experiment demonstrates the feasibility
of secure QKD over a 1002 km fibre channel considering the finite size effect.
The secure key rate is $3.11\times10^{-12}$ per pulse at this distance.
Furthermore, by optimizing parameters for shorter fiber distances, we conducted
performance tests on key distribution for fiber lengths ranging from 202 km to
505 km. Notably, the secure key rate for the 202 km, the normal distance
between major cities, reached 111.74 kbps.
