An off-road vehicle comprising a frame; a plurality of wheels connected to the frame, the plurality of wheels comprising at least one front wheel (91,121) and at least one rear wheel (92, 122); a suspension assembly comprising a front suspension and a rear suspension, the front wheel (91, 121) being connected to the frame by the front suspension, and the rear wheel (92, 122) being connected to the frame by the rear suspension; a prime mover assembly comprising an engine and a power output shaft, the engine being at least partially arranged on the frame and comprising an engine body and a cylinder head connected to the engine body, the engine being connected to the power output shaft; a transmission system mounted on the frame, the transmission system comprising a front transmission assembly connected to the front wheel (91, 121) and a rear transmission assembly connected to the rear wheel (92, 122); wherein the front transmission assembly comprises a front rotation shaft, and the front transmission assembly rotates around the front rotation shaft, the rear transmission assembly comprises a rear rotation shaft and a rear output shaft, and the rear transmission assembly rotates around the rear rotation shaft, the rear output shaft is connected to the power output shaft; characterized in that a longitudinal mid-plane is defined as a plane perpendicular to a width direction of the vehicle and where a center line of the vehicle in a width direction is located, a straight line L1 is defined as a straight line connecting a projection point of the cylinder head mid-point projected on the longitudinal mid-plane of the vehicle in the width direction and a projection point of an axis of the front rotation shaft projected on the longitudinal mid-plane of the vehicle in the width direction, a straight line L2 is defined as a straight line connecting the projection point of the cylinder head mid-point projected on the longitudinal mid-plane of the vehicle in the width direction and a projection point of an axis of the rear rotation shaft projected on the longitudinal mid-plane of the vehicle in the width direction, and a ratio of the length of L1 and the length of L2 is in the range from 0.4 to 1.8. a frame; a plurality of wheels connected to the frame, the plurality of wheels comprising at least one front wheel (91,121) and at least one rear wheel (92, 122); a suspension assembly comprising a front suspension and a rear suspension, the front wheel (91, 121) being connected to the frame by the front suspension, and the rear wheel (92, 122) being connected to the frame by the rear suspension; a prime mover assembly comprising an engine and a power output shaft, the engine being at least partially arranged on the frame and comprising an engine body and a cylinder head connected to the engine body, the engine being connected to the power output shaft; a transmission system mounted on the frame, the transmission system comprising a front transmission assembly connected to the front wheel (91, 121) and a rear transmission assembly connected to the rear wheel (92, 122); wherein the front transmission assembly comprises a front rotation shaft, and the front transmission assembly rotates around the front rotation shaft, the rear transmission assembly comprises a rear rotation shaft and a rear output shaft, and the rear transmission assembly rotates around the rear rotation shaft, the rear output shaft is connected to the power output shaft; characterized in that a longitudinal mid-plane is defined as a plane perpendicular to a width direction of the vehicle and where a center line of the vehicle in a width direction is located, a straight line L1 is defined as a straight line connecting a projection point of the cylinder head mid-point projected on the longitudinal mid-plane of the vehicle in the width direction and a projection point of an axis of the front rotation shaft projected on the longitudinal mid-plane of the vehicle in the width direction, a straight line L2 is defined as a straight line connecting the projection point of the cylinder head mid-point projected on the longitudinal mid-plane of the vehicle in the width direction and a projection point of an axis of the rear rotation shaft projected on the longitudinal mid-plane of the vehicle in the width direction, and a ratio of the length of L1 and the length of L2 is in the range from 0.4 to 1.8.