The plane coupling dynamic model of pantograph and catenary was established by using pantograph's ternary concentrated mass element and elastic catenary's contact element. The actual line of Beijing-Shanghai high-speed railway is taken as the simulation object.When the train running speed reaches more than 350 kilo- meters per hour, dynamic performance parameters of catenary in different contact line tension systems are ana- lyzed with the constant tension of elastic sling and messenger wire. According to the design specification of high-speed railway, dynamic performance parameters of pantograph system at four kinds of operating speeds are compared, and pantograph dynamic simulation software is used to realize the dynamic response of pantograph system over 350 kilometers per hour. Research shows that: when the running speed reaches more than 350 kilo- meters per hour, the dynamic parameters of the catenary meet pantograph single bow running speed; as the ten- sion of elastic sling and messenger wire remains unchanged, contact wire level and tension uplifting of panto- graph on the anchor point will increase with increase of speed, thus affecting the flow quality and reliability of pantograph-catenary.