论文首先以萨尔浒之战、宁远之战为分界点，将明清军事技术对抗分为三个阶段，分析不同阶段中明清军事技术对抗的特征。
Firstly , the dissertation took the battle at Sa er hu and the battle at Ning yuan for boundary points and divided Ming-Qing military technology rivalry into three stages and construed the characteristic in different stages .
宁远之战