Title: FlexPose: Pose Distribution Adaptation with Few-shot Guidance. Abstract: Annotating human pose images can be costly. Meanwhile, there is an unavoidable major performance drop when a pre-trained pose estimation model is evaluated on a new dataset. We observe that pose distributions from different datasets share similar pose priors with different geometric transformations, which inspires us to learn a pose generator that can flexibly be adapted to generate the pose of a new pose distribution. In this paper, we treat human poses as skeleton images and propose a scheme to transfer a pre-trained pose annotation generator to generate poses from the transferred distribution of a newly collected dataset with only a few annotation guidances. By finetuning a limited number of linear layers, the transferred generator is able to generate similar pose annotations to the target pose distribution. We evaluate our FlexPose on several cross-dataset settings qualitatively and quantitatively. FlexPose surprisingly achieves around 41.8$\%$ performance improvement on the Unsupervised Pose Estimation task when it transfers the pose distribution of COCO, 3DHP and Surreal dataset to that of the H36M dataset.