[Objectives] Bamboo forest thinning is one of the effective ways of bamboo forest regeneration. To determine the effects of thinning on the regeneration of Bashania bamboo forests and foraging selection of Giant Pandas (Ailuropoda melanoleuca), we conducted a three-year (2017-2019) monitoring on the belt thinning plots with a size of 30 m × 60 m (Fig. 1) each in the Bashania bamboo forest, which is located in the non-major foraging areas (with old and dense bamboo stems) of Giant Panda in the Foping National Nature Reserve of Shaanxi Province. [Methods] We obtained in total 10 102 group data of bamboo regeneration, 1 119 Giant Panda feeding bamboo data and 32 215 infrared camera trapping data. By using SPSS t test, we analyzed the difference on bamboo regeneration between the belt thinning plots and the control plots with P < 0.05 representing a significant difference and P ≥ 0.05 representing no significant difference. We also counted the numbers of selected bamboo shoots, mature bamboos and produced feces by Giant Pandas, and calculated the occurring frequency of Giant Pandas and its sympatric animals based on infrared camera photos in order to insight the impacts of bamboo thinning on its regeneration and Giant Pandas’ food selecting. [Results] Our results showed that (1) about bamboo shoots, theie number increased significantly in the thinning plots, and the basal diameters (Fig. 2) and heights (Fig. 3) in the belt thinning plots are significantly smaller than the ones in the control plots (Except height of bamboo shoots in the 1st year), and no significant difference in the 3rd year. (2) About the mature bamboo stems, their number increased also significantly in the thinning plots, and the basal diameters (Fig. 4) and heights (Fig. 5) in the strip thinning plots are significantly smaller than the ones in the control plots (Except height of mature bamboo in the 2nd year), and no significant difference in the 3rd year. (3) The Giant Panda showed a preference to the thinning plots with more feeding on bamboo shoots and young bamboos. The numbers of bamboo stems selected and feces deposited in the thinning plots were significantly higher than those in the control ones (Table 1). Giant Pandas show a longer duration of staying in thinning plots (Fig. 6). (4) The total 23 species including Giant Panda and other sympatric species through camera trapping in the thinning plots (Fig. 7), and the highest occurrence of the Giant Pandas in the months of January, April, May and December with feeding on bamboo shorts and leaves. [Conclusion] Therefore, 2 m-width strip thinning can change the age structure of bamboo forest, improve its ageing problem and increase the range of suitable habitat for giant panda forging. We can gradually generalize this strip thinning technique in the habitat of Giant Pandas with seriously aging bamboo forest, and can be applied in protection and management of the food base areas of the captured Giant Pandas.