Abstract: At present, the investment in offshore oil exploration is small, resulting in a small number of exploration wells and evaluation wells. The reservoir data obtained by routine tests is not sufficient as the basis for formulating development plans. In response to this problem, the research on the integrated testing and production technology in offshore oil and gas wells was carried out. First of all, from the acquisition of sufficient reservoir data, a corresponding evaluation test system was designed. Secondly, taking into account the long time and high risk of the test tools in the well, the supporting test column structure was designed. Finally, in order to reduce the test cost, a scheme of long-term evaluation test by drilling platform was designed.The application shows that through the evaluation test, the type and reserve of gas reservoirs can be clearly identified, the amount of reserves of reservoirs can be determined, and the law of production can be evaluated. By optimizing the design of test string structure, the function realization of tool can be simplified and the test risk can be reduced. Through the innovation of offshore industry, the waste of drilling platform resources and oil/gas resources can be reduced, safety and environmental risks and operating costs also can be reduced.