Authentication of user in Wireless Sensor Network (WSN) needs research and investigation due to all the characteristics of these networks, such as limitations of power, computation capability and storage resources with the increasing security threats and attacks. All of the popular User Authentication (UA) schemes in WSN are provide only log in time authentication and for checking the authenticity of user no biometric (physical) property of user is applied. In this paper, we enlighten different new approaches that can be effectively used as a UA scheme in WSN.