Abstract: Applications of pocket base connections for steel latticed columns were increased in single-story industrial workshops, but basic research on this type of column bases was insufficient. Quasi-static tests of four pocket base connections for steel latticed columns were carried out to investigate their seismic behaviors. Influences of the grouting material type, volume stirrup ratio of cupped foundation, and existence of studs or base plate on the seismic behaviors of column bases were analyzed. The results exhibited three failure modes of pocket base connections for steel latticed columns, including the cracking of the secondary pouring interface, pullout of the tensile chord, and buckling of the compressive chord. Bearing capacities of specimens with the first two failure modes were lower, while the specimen with compressive chord buckling had a higher bearing capacity and a plumper hysteretic curve. Compared with specimens with tensile chord pullout and secondary pouring surface cracking, the bearing capacity of the specimen with compressive chord buckling was increased by 324% and 25%, respectively. Based on the experimental results and relevant analysis, it is demonstrated that pocket base connections for steel latticed columns should be arranged with studs in the embedded parts or with a base plate at the bottom of the chord. When the embedment ratio is reduced to 2.0, which is lower than the requirement of the current Chinese seismic standard, excellent seismic performance can be also achieved if the cementitious grout is used in the secondary grouting and the volume stirrup ratio of cupped foundation is increased.