Abstract: The implementation of XBee or ZigBee is usually applied on the wireless sensor network (WSN). In this case, the issues due to the Wireless Sensor Network (WSN) intends for wireless data communication applications are the usage of bandwidth, data rate, cost installation, low energy consumption and reliable data transmission. The WSN works with boundaries of optimal level of realibility of the network. In the process of communication, it need a good data delivery services. To determine the performance ofthe WSN, it should test the Quality of Service (QoS) of the XBee such as measuring the delay, throughput and packet loss percentage. Testing of this QoS based on Line of Sight (LoS) and Non Line of Sight (NLoS). The protocols of XBee has applied the IEEE 802.15.4 that are a network and application layer above the physical layer and Medium Access Control (MAC).