The purposes of this study were to prioritize the factors for selecting chemical transport firms, to study the relationship between characteristics of business with the factor for selecting chemical transport firms and to find out the problems of transportation service. Data were collected through the use of questionnaires. The sample size was 74 chemical business firms in Bangkok Metropolitans. The study found the arrangement factor for selecting chemical transportation service as following: First, the quality of transport service, the second efficiency and availability of equipment tool vehicle staff and the third, transportation cost, the safety. Also found that different types of business and size of capital were the important factors for selecting chemical transportation firms in significance 0.05. The producer businesses selected the quality of transport service first. But the distributor businesses and all the producer / distributor businesses selected the safety first. About the size of capital, the small businesses (less than 50 million baht) selected the quality of transport service first. The median businesses (between 50-100 million baht) selected efficiency and availability of equipment tool vehicle staff first. But the large businesses (more than 100 million baht) select ed safety factor first for selecting chemical transport service. The study also showed that there are two main problems of transportation service caused by inefficiency of staff and management. The problems caused by staff were lack of coordination among the concerned parties, less knowledge about their job, lack of interest of staff in their job. The problems caused by management were an inability to delivery goods on time, damage and lose of goods and accident from equipment.