This article is about the ideology of political parties of Republic of Moldova. The author analyses the process, which take place in the politicalideological spectrum, especially the ideologic aspect of the political parties represented in the Parliament after the elections from 6 March 2005. It is focused on the importance of theirs ideological programms and doctrines, which influences the identity of the political parties. The author examines in this study the role of political ideology in the activity of the parties, the differences between their adopted programms and their declarations or actions. This is a comparative study, analyses the ideologies like communism, socialdemocracy, christian-democracy and social-liberalism and their patterns and inadvertences in the postcommunist space, including the Republic of Moldova. The author describes the degree of assimilation of these ideologies from the political parties and the function of the party system, the ideological configuration of the Parliament of the Republic of Moldova, especially a comparation between the new Parliament of 2005 and the last of 2001. This article presents a classification of the political parties on the political spectrum using ideological criteria from right to left side and their characteristics. The probleme of political parties ideology has never been studied in the scientific literature in our country, this research containes some recommendation for the political parties reffering to their programms and their ideological attitudes.