Objective Biomechanical analyses of straight techniques for Chinese male skaters during the 1500-m race were conducted to determine the influence of motion techniques on sports performance. Methods Thirty-four male skaters participating in the 1500-m National Speed Skating Championship race were selected as research subjects. Kinematic characteristics were collected using three-dimensional fixed-point video analysis. The correlations between the periodic characteristics, motion phase characteristics, moment characteristics, and periodic velocity were analyzed. Results The period distance (r=0.560), gliding distance (r=0.554), and push-off distance (r=0.512) showed strong positive correlations with the periodic velocity. The trunk angle (r=0.651), mean ankle angle (r=0.434), and ankle angle (r=0.446) showed moderate or high positive correlations with the gliding velocity. The mean trunk angle (r=-0.427) showed a moderate negative correlation with gliding velocity. Additionally, the mean trunk angle (r=0.673), hip extension angle (r=0.804), abduction angle (r=0.560), and abduction angle speed (r=0.566) were highly positively correlated with the push-off velocity. The mean push-off angle (r=-0.605) showed high negative correlations with push-off velocity. Conclusions The velocity of a straight line in 1 500-m speed skating depends on the dancing distance. Greater gliding and push-off distances result in higher velocities. The trunk and ankle angles significantly influence the gliding velocity, and appropriately increasing the range of the trunk angle can effectively improve the gliding velocity. The trunk, hip, and push-off angles are key determinants affecting push-off velocity, and actively extending the hip and pushing-off can effectively enhance push-off velocity.