To evaluate economic and technical feasibilities of Chang 8 reservoir in Zhengjing oil field developed by horizontal well, HH37P1 well was arranged. The construction difficulties were analyzed with corresponding technical measures. By optimizing bottom hole assembly, controlling well trajectory, regulating drilling fluid properties and combining corresponding engineering technology, HH37P1 horizontal well was successfully drilled. The combination of logging data and logging showed the initial success by using presetting pipe string completion and following fracturing reformation. The successful implementation of HH37P1 horizontal well provides a new approach to effective development of Zhenjing oilfield.