Interconnected hydropneumatic suspension has important significance to eliminate large load to frame caused by uneven road and to achieve better roll characteristics, which is generally used in engineering vehicles constantly developed toward large tonnage and high speed.Taking the interconnected hydropneumatic suspension system as the research object, through test and simulation, the pressure difference between the two ends of the damping hole and the force of the piston rod were analyzed. The mathematical model of the hydropneumatic suspension was established. The parameters affecting the performance of the suspension were found out. A double cylinder interconnected hydropneumatic suspension test rig was built. By changing the damping hole diameter, cylinder movement speed, accumulator charging pressure, two cylinder phase difference and other parameters, the interconnected hydropneumatic suspension characteristics were analyzed on the suspension test rig, the influences of different parameters of hydro pneumatic suspension on damping holes both ends pressure difference changes and piston rod force were analyzed. The interconnected hydropneumatic suspension model was built based on the AMESim. Through comparison between simulation results and test results, the model parameters were modified, the analysis model of the interconnected hydropneumatic suspension in different working conditions was eventually built. The analysis method and the analysis results can guide the oil and gas suspension design and research.