[Objective] Morphological characteristics, different orientation section profile characteristics, and erosion and deposition effects of concave surfaces of biodegradable poly lactic acid (PLA) checkerboard barriers with different sizes were analyzed to provide evidence on which to base the specification parameter selection of PLA checkerboard barriers.[Methods] The biodegradable sandbag checkerboard barriers laid on the edge of the Jilantai Salt Lake in the Inner Mongolia Autonomous Region were undertaken for research. The sizes of the checkerboard were 0.5 m×0.5 m, 1 m×1 m, 1.5 m×1.5 m, and 2 m×2 m. The shape of the concave surface was measured, pictures of the shape of the concave surface were drawn, and the parameters of the erosion and deposition after the wind period were calculated.[Results] A sand surface can form a stable concave surface for the four kinds of PLA checkerboard barrier. The center was lower than the surrounding parts in the PLA checkerboard barriers. The strengths of net deposition in the 0.5 m×0.5 m, 1 m×1 m, 1.5 m×1.5 m, and 2 m×2 m PLA checkerboard barriers were 17.29, 7.09, 0.61, and -8.2 g/cm², respectively.[Conclusion] Before the stable formation of the concave surface, the sand grains of the PLA checkerboard barriers of 0.5 m×0.5 m and 1 m×1 m were mainly deposition. The volume of erosion and deposition was close to equilibrium in the 1.5 m×1.5 m PLA checkerboard barriers. The sand surface was wind eroded at the initial stage in the PLA checkerboard barriers of 2 m×2 m, but when the sand surface formed a stable concave surface, the PLA checkerboard barriers could control wind erosion of the sand surface.