Process of peanut inflorence primordium development has been observed with scannidg microscopy and plastic thin section microscopy. It includes that an observation cf the first inflorencence primordium development during embryo formation, the first flower primordium differentiation during seed germination, and the morphogenesis of every component of a flower while young seedling grews up. A few discoveries have been obtained, i. e., inflorencence bract and shoot scale having different morphogenesis origination should not be obscured, the inflorencence type of peanut belongs to spike inflorencence not racemose, and the socalled calyx tube is made up of calyces, petals and filoments but not modified calyx. Therefor the tube-like thing should be named flower tube in lien of calyxtube.