Since the late 1970s, there have been two mainly macroscopic climate changes in tropical cyclone (TC) over the western North Pacific (WNP) under global warming. One is the decadal decrease in the TC frequency, especially over the southeastern part of WNP, and the other is the trend of northwestward migration in TC genesis and activity location. This article summarizes the research progress on these two aspects as follows. Recent studies show the enhancement of vertical wind shear may be the main reason for the decrease of TC frequency in summer and autumn, which is closely linked to the large-scale environmental changes induced by Indo-Pacific sea surface temperature (SST) anomalies. Some studies show the multi-decadal oscillation of North Atlantic SST is also important to the decrease of TC frequency in WNP. However, the frequency of intense TC is increasing over the western part of WNP, which is possibly related to the regional warming in the coastal waters of East Asia, though such change is still in debate. During the recent two decades, WNP TC activities are observed to shift westward, including the genesis location and track, which is probably controlled by the ENSO shift and the late-1990s Pacific climate shift. Besides, the northward expansion of tropical circulations induces TC favorable environment to shift northward, contributing to the poleward migration of WNP TC activities.