In P2P networks, due to the diversity of population density, there is an imbalance on users' demands towards the internet resources. This paper proposes a method called "An Adaptive Load Balancing Strategy of Application Layer Based on Score of Customer Satisfaction", ALBS-SCS for short. The method gives a score on the QoS of current networks periodically, and then gives feedback to the system, and eventually the system adjusts its services accordingly. This kind of method can truly improve user experience by providing better Multicast User Satisfaction (MUS) for the end systems of the hot spo...