To provide a liquid injection method, a recharge method and a chemical grouting method by which the liquid like the ground water or the chemical is properly injected along a longitudinal direction of a pipe laid in the ground.

Multi-layered well pipes 9a, 9b, 9c, 9d having gaps between the inner parts and the outer parts are laid in a laying hole 8 in the ground in the ascending order of the pipe diameter from the deepest side of the laying hole 8 in a state that the inlets of the well pipes are out of alignment. Thus, the inlets of the well pipes are located at different places in a longitudinal direction of the laying hole, and the liquids fed into the pipes, respectively, are discharged from the inlets of the pipes, respectively, at different places in the longitudinal direction of the laying hole. Packers 10a, 10b, 10c, 10d attached to the well pipes, respectively, are expanded to form a plurality of separate injection areas 11a, 11b, 11c, 11d. Consequently, injection into each injection area is enabled, and the liquid like the ground water or the chemical is properly injected into the ground along the longitudinal direction of the multi-layered well pipes.