The present disclosure provides a drug carrier having a structure represented by the following formula (1): In formula (1), the symbols are defined in the specification. The drug carrier exhibits high loading efficiency of a nucleic acid or a pharmaceutically active substance and high stability. Light modulation or acid modulation enable the drug carrier to release the nucleic acid or the pharmaceutically active substance at selective time and region. Therefore, the drug carrier can be applied to a drug delivery system to solve the problem of the low drug response in clinical trials.本發明提供一種藥物載體，其具有如式(1)所示的一結構：式(1)中各符號如說明書中所定義者。所述藥物載體能高效率地包覆核酸或醫藥活性物質，且具有高度儲存穩定性，並能藉由光調控機制或酸鹼調控機制選擇性地釋放包覆於其中的核酸或醫藥活性物質，進而可應用於藥物傳遞系統中，解決臨床上低藥物響應性的困境。
