It is urgent for electronic material industry to research and develop lead-free solders and protect patent of lead-free solders.Combined the characteristics of China patent,this paper described the competition of lead-free solders all over the world and application status of Sn-Zn lead-free solders analyzed the devel- opment and application of Sn-Zn lead-free solders,characteristics and application obstacle of Sn-Zn lead-free solders applied patent,It expect to contribute to develop self intellectual proper...