Liuluoyu area is a new block in the tight oil exploration and development zone of Yanchang Oilfield, and Chang8 Member is the key level of tight oil development. Affected by source rock, reservoir characteristics, reservoir pressure, source-reservoir configuration relationship, and natural fractures, Chang 8 Member tight oil has obvious oil content differences. Therefore, based on the analysis of the characteristics of source rock and reservoir, the experimental data and logging data are combined to estimate the hydrocarbon generation intensity, calculate the reservoir formation power, analyze the relationship between source rock and reservoir, and evaluate the fracture development characteristics by using the fractal dimension method. The results show that: (1) The average organic carbon content of source rocks in Chang 7 member and Chang 9 member is 10.23% and 8.67% respectively; Hydrocarbon generation intensities were (50~470)×10⁴ t/km² and (10~130)×10⁴ t/km², respectively. The residual pressure difference of Chang 7-8 and 9-8 sections is 4.0~11.0 mpa and 3.0~9.0 mpa, respectively. (2) According to the four types of source rocks in the longitudinal direction, they are: Chang 7₃ bottom+Chang8middle+Chang9 top development type, Chang7₂ member+Chang9 top development type, Chang7 member continuous development+Chang 9 top development type, Chang7 undeveloped + Chang 9 top development type; There are five hydrocarbon supply modes: "top + bottom bidirectional strong hydrocarbon supply type", "top strong hydrocarbon supply type +bottom weak hydrocarbon supply type", "top + bottom weak hydrocarbon supply type", "top + bottom weak hydrocarbon supply type" and "top + bottom medium hydrocarbon supply type". (3) R/S method was used to predict the fracture development of Chang 8 member, and H curve was constructed with H value >0.04, indicating fracture development; 0<H < 0.04, the crack is more developed; When H < 0, cracks do not develop.