The reservoir of KT block in Qaidam Basin has the characteristics of low porosity and ultra-low permeability, and there is no initial production or low production after perforation, so the gas flow can only be obtained by fracturing. After the preliminary evaluation and exploration stage of understanding the reservoir, the reconstruction idea is changed to the volume reconstruction model, and the main goal is to increase the reconstruction volume and fracture complexity. KP1 well is the first horizontal well in KT area. In order to explore the production and efficiency improvement method of N1 tight gas horizontal well in Mangya Depression, the horizontal well volume fracturing test and fracturing evaluation were carried out through the optimization of construction parameters and the study of measures. The coincidence rate of the fracturing plan design was greater than 98%, which formed a set of optimal design method of tight gas reservoir fracturing transformation. It provides technical support for the exploration and evaluation of this kind of reservoir.