Nowadays, there is a demand from investors and managers for additional disclosure of high quality information to reduce the problem of information asymmetry and uncertainty about the company's future performance and to facilitate the stock trading process, thereby firm value will be affected. Also, the quality of this information will be of particular importance in the efficiency of markets. Previous research has tried to measure it, and in some cases the quantity of disclosure has been considered a representative of the quality of disclosure. In this research, the application of different measures has been discussed according to the characteristics of research and environment and Iran's information needs. Accordingly, the voluntary disclosure checklist was selected as an appropriate approach that has a high degree of flexibility in proportion to the various research topics and the concept of quality. In the following, based on the literature related to this field and some adjustments, a model containing 211 information indicators was designed in 10 dimensions and provided to experts to determine the importance of each information item. In order to confirm the model and determine the effective indicators, confirmatory factor analysis and t-test were used. Finally, a model containing 180 items with relevant weights for measuring the quality of voluntary disclosure of companies listed on the Tehran Stock Exchange is presented.