Remaining oil testing in horizontal Wells is one of the technical bottlenecks for exploring potential of remaining oil in horizontal Wells due to its difficult testing methods, difficult selection of instruments, low interpretation accuracy and high testing cost. In order to find an economical, efficient and practical horizontal well testing technology, a comparison test between liquid production profile and oil saturation profile of 11 horizontal Wells was carried out in a shallow conventional heavy oil ultra-high water cut reservoir in Jidong Oilfield. After a lot of careful field practice, it is found that the upper section with relatively high remaining oil saturation generally corresponds to the low production liquid section and the shut down liquid section. The interval with low oil saturation generally corresponds to the main liquid producing section, indicating serious washing. Under the influence of various measures, the saturation of low production liquid section may be lower, which indicates that the oil reservoir is used perfect, and the late plugging has a great impact on the liquid production capacity. The test technology that matches the shallow reservoir with sufficient liquid supply capacity, low formation water salinity and different completion string was found, and the rule of horizontal well liquid production and the rule of remaining oil distribution was explored, which provided a basis for measures to tap the potential of horizontal Wells and comprehensive reservoir management, and provided a reference for similar reservoir testing and management.