Triangular tri-channels polyvinylidene fluoride (PVDF) membranes were prepared by solution induced phase separation method through special spinneret. The effects of the PVDF concentration in drop and internal coagulant composition on the morphology and properties of membranes were investigated. It was found that: large finger-like morphology became smaller, the overall level of integration decreased, sponge-like morphology became denser, UF water flux, gas permeation coefficient and VMD water flux decreased, breaking strength increased with the concentration of PVDF in drop increased from 14.5wt% to 18.2wt%. Large finger-like mor- phology became smaller, sponge-like morphology became denser, UF water flux and gas permeation coefficient decreased, VMD water flux increased a little, breaking strength increased with the concentration of DMAc in internal coagulant increased from 0 to 30%. The optimized triangular tri-channels PVDF membranes decreased in flux compared with one-hole membranes, however, the breaking strength increased a lot, nearly three times of one-hole membranes.