We theoretically and experimentally investigate the long-range interaction between nematicons.It is demonstrated that the interaction becomes strongest when the pretilt angle of liquid crystal molecules is nearly π/4for a given single-beam input power Po,and that the interaction becomes stronger when the incident power P0 increases at a given pretilt angle.In this way,the interaction is still observed when the initial separation is 43 times of the soliton width,much larger than that implemented in lead glasses[Nature Phys.2 (2006) 769].