There were written a lot about the Party System of Post-Soviet Georgia in recent years. However, the research and the results of Party institutionalization are not exhaustive. In the article, we will analyze the institutionalization of Georgian political parties for 1990-2012 years. The article is based on a weak theory of party system institutionalization. The mentioned theory gave us opportunity to analyze Parties institutionalization based on the Specific dimensions. To analyze parties institutionalization we used Qualitative Research Methods, non-probability sampling type target selection and conducted semi-structural in-depth interviews with political parties. More precisely, beside the in-depth interviews during the analysis for the obtaining of information and for more convincing of research methods we used documents analysis method. Basing on the research result it had been defined, that we are facing too weak Party institutionalization in Georgia and in this point of view all three former governments stood in the unenviable position (Gamsakhurdia, Shevardnadze, Saakashvili). The research showed weak institutionalization of party system hinders sustainable development of parties and interaction with voters. In accordance with the research results weak institutionalization of the party system is largely caused by the clientelistic ties and personalization existing in the politics.