We report ALMA observational results of [CII] 158 um toward a lensed sumibllimeter galaxy, SDP.81. This observation was conducted in 2016 as a cycle 4 program (PI: T. Ishida). The effective resolution reaches ~400 pc at z=3.042 and is high-resolution enough to spatially resolve the [CII] distribution. We reconstructed the source plane using GLAFIC and found its velocity field can be explained by ordered rotation and expanding shell-like morphology. The latter component is a spatially resolved [CII] outflow. The outflow mass rate is larger than 190 Msun/yr, which is comparable to SFR (=527 Msun/yr). The energy source can be either radiation pressure or supernovae.