To clarify the induced factors of crossborder river water conflict is the premise of reducing the risk of crossborder river conflict. Based on the database of crossborder rivers, this paper sorted out the causes of crossborder river conflicts, and screened out the typical rivers. Then, we explored the induced factors of water quantity conflict in typical rivers and extract the common factors. Finally, the optimal scale regression model was used to verify the common factors and quantitatively analyze the influence of the common factors induced by water quantity conflict. The results showed that population factors, economic factors and natural factors had significant impacts on water quantity conflict, among which natural factors were negatively correlated with water quantity conflict, while the influence of political and diplomatic relations and constraint system was not significant.