In 2019，PTB/PVDA emerged as the most potential political force in the current general development dilemma of the western communist parties. There were many twists and turns in the development of PTB/PVDA. It has embarked on the road of rising since the Party Congress of 2008 that achieved the “renewal” of theoretical strategy，and put forward the strategy of combining “principle” and “flexibility”. The process of the rise of PTB/PVDA is the implementation process of the strategy of combining “principle” and “flexibility”. Under the guidance of this strategy，PTB/PVDA has formulated a series of rigorous，pragmatic and flexible action tactics that show the party’s political position and identity. These distinctive and effective political practices have laid the foundation for the rise of PTB/PVDA，and also have reference and inspiration significance for western communist parties which are currently facing the confusion of strategic choice.