Subway track construction is of great significance to urban traffic.There are no precise leveling vehicles for tunnel construction in the existing market,so a control algorithm for leveling hydraulic system of precision leveling vehicle was designed to reduce workers' labor intensity,improve pavement evenness and enhance construction efficiency.The AMESim parametric modeling of the leveling hydraulic system of the precision leveling vehicle was carried out to design Fuzzy-PID algorithm and sliding mode variable structure control algorithm in MATLAB,which were used to compare and control the leveling system model.According to the leveling system hydraulic cylinder piston rod displacement accuracy,piston rod tracking time,leveling eylinder pressure change,leveling cylinder flow change and other parameters,the three algorithms including traditional PID,Fuzzy-PID and sliding mode variable structure control algorithm were simulated and compared.The results show that in the presence of uncertain external interference,compared with other algorithms, Fuzzy-PID algorithm has great advantages in system stability,leveling accuracy and leveling time under the condition of excellent parameter setting.