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A gas detector 140×140×140 mm3 in size,ter-med the compact active target time projection chamber(CAT-TPC),was developed in this study to measure res-onant scattering associated with cluster structures in unstable nuclei.The CAT-TPC consists of an electronic field cage,double-thick gas-electron-multiplier foils,a general-purpose digital data acquisition system,and a newly developed two-dimensional strip-readout structure.The CAT-TPC was operated using a 4He(96％)+CO2(4％)gas mixture at 400 mbar.The working gas also serves as an active target for tracking charged particles.The overall performance of the CAT-TPC was evaluated using a collimated α-particle source.A time resolution of less than 20 ns and a position resolution of less than 0.2 mm were observed along the electron drift direction.Three-dimensional images of incident trajectories and scattering events can be clearly reconstructed under an angular res-olution of approximately 0.45 degree.