A novel semi-packed micro-fabricated gas chromatographic column（ μGCC） chip is designed and fabricated based on micro-electro-mechanical systems（ MEMS） technology

and this μGCC chip contains regular micro elliptic cylindrical posts array. Compared with existing semi-packed μGCC

the proposed μGCC has larger surface area and more even velocity field distribution

which play important roles in improving the separation resolution and column efficiency of the chip. Heavy hydrocarbon mixture and benzene series are separated

and the maximum number of theoretical plates are 9 246 plates/m.