The presence of survey's institute hold a strategic role for a politicians as well as for the political party in every political moments, but the main requirement for a survey institute to maintain the public trust in them is their credibility. This study aims to find out politicians' opinions and factors influencing their opinions about the credibility of survey institutions in relation with electability in the election of legislative representatives in South Sulawesi Parliament in 2014. This descriptive qualitative research involved twelve politicians from different parties and four survey institution officials as informants. They were selected purposively. The data were collected through interviews and observations; and were analysed by using the interaction analysis model developed by Milles and Huberman. The data were processed through three channels of qualitative data analysis: reducing the data, presenting the data, and drawing the conclusion. The results reveal that politicians tend to trust the credibility of survey institutions and the results of electability survey released by the institutions. This is influenced by internal and external factors. Internally, the politicians are influenced by their experience and education. Externally, they are influenced by party traditions and the credibility of survey institutions. Furthermore, according to the politicians. There are five criteria for credibility of a survey institutions, including track record of the institution, track record of the institution's leader, proffesionality of human resources, positive image, and clear addres of office. Survey institutions maintain their relationship with politicians through emotional approach and professional approach. It is expected for the survey institutions to formulate a relevant method of survey for every existing political dynamis, such as for the money politics phenomena in the recent local elections. As for the politicians them selves, they have to be more selective and based on the ideal standard in utilizing the survey institutions