Silver nanomaterials have gained much attention for various applications including electrodes, sensors, and catalysts due to their high conductivity, surface plasmon resonance, and high surface activity. Among silver nanomaterials, silver nanowires have been extensively studied for the fabrication of transparent and stretchable electrodes for wearable electronic devices recently. It is essential to control the thickness and length of pure nanowires in order to be used in a variety of fields based on silver nanowires In this presentation, the shows the synthesis of seed through polyole synthesis in a controlled response atmosphere for nanowires, and introduces the control of thickness and length of nanowires by growing the seed.