This study aims to clarify the influences of different types of ENSO on rainy-season precipitation over the Pearl River basin (ZRB). The multiscale moving-t test method was used to determine the onset and retreat of rainy season. The effects of different types of ENSO over the developing and decaying phase on rainy-season precipitation and their underlying causes are investigated. It could be pointed out that dry signals were identified over the developing and decaying phases of EPC. There is a higher possibility to trigger floods (droughts) over developing (decaying) ENSO and ENSO Modoki. Stronger anticyclone and monsoon are generally associated with increasing rainy-season precipitation. Clarifying the impact of multiple ENSO types on the spatial distribution of rainy-season rainfall in the Pearl River Basin can provide technical support and theoretical basis for national defense against floods and droughts.