Abstract : This study aims to identify the factors affecting import price of frozen shrimp from Thailand and Vietnam to Japan market by time-series monthly data from 2008 to June, 2019. The dataset of this study includes the monthly data covering from 2008 to June, 2019 about the imported price of shrimp products of Thailand and Vietnam in Japan market with total 138 observations. Error correction models was explored to estimate the factors influencing to the imported price of shrimp products of Thailand and Vietnam in Japan market. The explanatory variables includes in the models were determined based on the theory of demand and supply. Found results showed that, both in short and long run, the imported price of frozen shrimp from other countries such as Vietnam, China and India was indicated as the factors effect on the imported price of Thailand shrimp products (P < 0.01). Similar results were found for the case of Vietnam shrimp products imported to Japan (P < 0.01), suggesting Thailand, China, India and Vietnam were directly competitors for shrimp products in Japan market. Exchange rate between USD and JPY played an important role in the changes of import price for both Thailand and Vietnam frozen shrimp. In long run, the results of this research indicated that the implementation of quality assurance regulation caused of increasing in imported price of Vietnam frozen shrimp. Meanwhile, the application of new technology in shrimp cultured could improve the competition advantages of Thailand frozen shrimp.