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Several years ago, wireless sensor networks were used only by the military. These networks, which have many uses and are subject to limitations, the most important of which is the energy constraint, this energy constraint creates the requirement that the number And the length of the messages exchanged between the sensors is low. Sensor networks do not have a stable topology due to their inaccessible environments, and continually changes with the disappearance or addition of a node, support for the topology is performed in three steps before deployment, after deployment and deployment. . The sensor nodes are scattered across the field and transmitted by a multidimensional connection to the sink. The communication protocol of the sensor networks used by all nodes in the network and sink. The protocol consists of five layers and three levels of management. Sensor networks require a kind of security mechanism due to inaccessibility and protection. Conventional security mechanisms are inefficient due to the inherent limitations of sensor nodes in these networks. Sensor nodes, due to energy and resource constraints, require security requirements such as the confidentiality of data integrity data, authentication, synchronization, etc. Currently, many organizations use wireless sensor networks for purposes such as air, Pollution, Traffic Control and Healthcare Security is the main concern of wireless sensor networks. In this article, I will focus on the types of security attacks and their detection. This article outlines security needs and security attacks in wireless sensor networks. Also, the security criteria in wireless sensor networks are mentioned.