Investigation of the lateral load resistance of pile is made by laboratory model test on single and group piles. The experiments are carried out with varying size, spacing of piles in group and length to diameter ratio (L/d) of the piles. Lateral resistance of pile is a function of shape, size, spacing and length to diameter ratio (L/d) of the pile. In this study, model pile is single pile, and group piles having configurations are of (2x1, 2x2) which satisfy the Meyerhof’s relative stiffness limit of pile for flexible pile. For model pile embedded length to diameter ratio (L/d) are 20, 30, 35 and spacing are S = 3d, 4.5d, 6d. These experiments are conducted in the sand available at North-South region (Rajshahi) in Bangladesh. Lateral loads are applied in the single and pile groups by a lateral load setup arrangement. Due to the lateral load the pile are deflected. The load-displacement responses, ultimate resistance, group efficiency of piles with different spacing and number of piles in group have been qualitatively and quantitatively investigated in the experiment. From the load-displacement curve, ultimate lateral load resistances are obtained by double tangent method. Also some analytical methods proposed by Meyerhof, Patra & Pise used to determine the ultimate lateral load resistance of pile and pile groups. Finally, the lateral resistance of pile obtains by experiment and the ultimate lateral load resistances obtained by analytical methods are compared and trying to find out a analytical methods to determine the lateral reasonably for the sand are available at North-South (region) Rajshahi In Bangladesh.