The disclosure discloses a Chinese cabbage plasma membrane intrinsic aquaporin, having an amino acid sequence as set forth in SEQ ID NO. 2, and the nucleotide sequence of the encoding gene BraPIP1;1 thereof is as set forth in SEQ ID NO. 1. The plasma membrane intrinsic aquaporin has the characteristic of sensitively responding to neonicotinoid insecticides (thiamethoxam, imidacloprid, etc.) in the external environment. At the same time, it has the function of mediating transmembrane transport of the neonicotinoid insecticides, promoting accumulation of the neonicotinoid insecticides in plant roots and leaves, which has important application value in guiding efficient and simple use of pesticides, development of new systemic pesticides, etc.