Many recent studies accounts for the relationship between market risk measures and accounting risk measures. There is also a relationship between risk and bid-ask spread. Therefore some researchers have studied the relationship between financial information as measures of risk and bid-ask spread. The main goal of this paper is to review the relationship between financial information and bid-ask spread in Tehran Stock Exchange. Therefore 156 firms of statistical society that their necessary information for a three years period was available are selected. Then information about 14 independent variables is studied and bid-ask spread was measured as the dependent variable. Univariate and multivariate regression techniques were used to examine the hypotheses. The significance of the models was tested according to T-test and F-test. The conclusions account for that the model that includes total independent variables accounts for more than sixty eight percent of variations of the Bid-Ask spread.