The intensity and position of the western Pacific subtropical high (WPSH) have crucial effects on climate and disaster events in East Asia during summer. The WPSH significant northward jump (SNJ) events are the main manifestation of the seasonal evolution of WPSH, which are important for the precipitation over East Asia. Using the daily reanalysis datasets from year 1979 to 2020, this study further defines the early and late SNJ events of WPSH on the interannual timescale, which are connected separately with the tropical, mid-latitude subseasonal signals and the local air-sea interaction. However, the mechanisms of the WPSH-SNJ events are different in the anomalous early and late years. In the early SNJ years, the subseasonal signals from the mid-level East Asia-Pacific teleconnection pattern or the low-level boreal summer intraseasonal oscillation cause the positive 500 hPa geopotential height anomalies, which contribute to the significant WPSH northward jump in the first pentad of July. However, the above factors are unable to cause the WPSH-SNJ in the late years. Until the second pentad of August, the collaborative effects between mid-high latitudes wave trains over high levels and cold SST anomalies in the core region lead to the barotropic geopotential height anomalies and the lagged northward jump of WPSH