According to the design characteristics of advanced civil jet aircraft, especially about application of some new techniques and the requirements of family development, and based on traditional landing gear design method, the paper gives a study on a new design method of landing gear touchdown point in concept design phase from engineer design aspect. Meanwhile, following design steps, the restriction factors of landing gear touchdown point design are classified in safety, performance, structure, kinematics, operation, etc. Each restriction factor is clearly described in the paper.