The calculation models for crude oil viscosityare complex because of the determination of physical data,the limited calculation accuracy and application scope. Consequently, some representative straight chain alkanes were taken as model compounds of crude oil, and their viscosity and sound velocity were measured under different temperatures and pressures in this work. The influences of temperature and pressure on the sound velocity of straight chain alkanes were investigated, and the correlation model between viscosity and sound velocity was built on the base of experimental results. The experimental results indicated that the sound velocity of straight chain alkaneslinearly decreased with the increase of temperature and the decrease of pressure. The relationship between viscosity and sound velocity of alkanes was exponential type, and the viscosity sound velocity correlation model was applied to three different oils in Jidong Oilfield. The calculation results demonstrated a satisfactory applicability of the model. So, a feasible method was provided to reduce the dependence of conventional viscosity models on the physical property parameters.