In order to solve the problem that the crane can not accurately track achieving a straight line

comprehensive application of the theory of inventive problem solving（TRIZ）and the mechanism theory

the problem analysis and solving is carried out.From the perspective of system analysis of the port crane structure and material

field model between various elements of the relationship

the double rocker mechanism of ADAMS software simulation is established.Using actuator and computer communication

the actuator to achieve a straight line trajectory of the core technology is determined.By using of the conflict in the module based on TRIZ and standard method

the selection of design scheme

evaluation and modification are carried out.The principle solution of the port crane cranes to achieve trajectory control is proposed.