The violence is the issued most discussed in the studies of the street protests; therefore, this study focuses on how and why the violence of the street protests is transferred. The study employs the data source of the TTV news and searches for the relevant reports and stories relating to the protests, including 727 events from end of martial law to 2006 as the subjects.

The findings indicate that the percentage of the severe violence like injured persons and burned vehicles is reduced whereas that of the mild violence like corporal pushing and eggs throwing is higher. The preceding result demonstrates that there are still many mild violent incidents in the current protests. This study explains the trend via the police’s treatment against protests and indicates that most violence results from the bad interaction between the protesters and the police. The severe treatment increases the level of the conflict and violence in the street protests; accordingly, the opportunity of the violent incidents is reduced when the state stops suppressing the protesting mass. Therefore, following the political democratization, the police agency tends to avoid the severe treatment against the protesting mass; nevertheless, the protesting incidents with few persons or unorganized protesters still remain suppressed with the severe treatment by the police, especially the small and middle protest incidents without proper organization increase after the presidential election in 1996. Consequently, the mild violent incidents keep occurring in the street protests after the presidential election. in 1996.