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To wireless communication, it is easy to be interrupted by all sorts of factors, such as, antenna direction, transmission power, distance, nodes voltage and so on. And the reliable transmission of data is the key problem for Wireless Sensor Networks (WSN) in recent years. In former research, there are many methods which can ensure data reliable transmission, but can not choose the best performance path and reduce the bottleneck link effectively. So, on the basis of analyzing the influence of antenna direction, transmission power, distance and nodes voltage on LQI respectively, the paper proposes a new method—link quality indication based on metric (LQIBM), which can accurately find the link with severe packet loss rate in wireless networks firstly. Second, the model of LQIBM is constructed by Combining the mean and Coefficient of Variation (C.V) of link quality appropriately. Then, the hardware experiment platform is conducted by using wireless communication chip CC2430. Compared with LQIM, the results of simulation and experiment show that LQIBM succeed in finding the best communication path that has much lower packet loss rate, the miscarriage of justice is avoided for LQIM , the path with the bottleneck link is effectively excluded, and the better reliability of the data transmission is achieved for WSN