Constitutional Court decisions have different effects in each branch of law. This effect is higher in the branch of political parties law. All but one of the decisions, that the Constitutional Court appeals concrete constitutionality review, are related to the law of political parties. The effect of the Constitutional Court on political parties law can be examined under two headings. Firstly, the Constitutional Court (before 2001), cases filed with the allegation of violation of the secular Republic principle (Milli Nizam Partisi, Refah Partisi, Fazilet Partisi), decided to annul the provisions that provided the relevant political parties with the opportunity to defend themselves and made them difficult to dissolve. Secondly, the Constitutional Court (after 2001); the provision stating the dissolution of political parties which twice in a row to don't attend the Grand National Assembly of Turkey's general elections , the provision stating that the closure decision will not affect the legal consequences of the dissolution case, regulation on deprivation of state asistance partially or completely for political parties which not apply the warning order, decided to cancel. In conclusion, it can be said that the Constitutional Court adopted an approach that facilitated the dissolution of political parties before 2001, and made it difficult to impose sanctions on political parties after 2001.