Three acceptor-donor-acceptor(A-D-A) conjugated oligomers, i.e., O1, O2 and O3, have been synthesized using diketopyrrolopyrrole(DPP) as an electron-acceptor unit, and naphtho[1,2-b:5,6-b’]dithiophene(NDT), anthra[1,2-b:5,6-b’]dithiophene(ADT) or dithieno[3,2-b:3’,2’-b’]naphtho[1,2-b:5,6-b’]dithiophene(DTNDT) as electron-donor unit. These oligomers exhibit identical highest occupied molecular orbital(HOMO) and lowest unoccupied molecular orbital(LUMO) energy levels, which were ca.-5.1 and-3.3 eV, respectively. Upon thermal annealing, all three oligomers formed thin films with ordered microstructures, and their organic thin film transistors(OTFTs) exhibited p-type transport behavior. The mobility was increased with an extension of the size of D-units. O3 showed the best OTFT performance with the mobility of up to 0.20 cm~2·V~(-1)·s~(-1). The film quality of O3 was improved by adding 1 wt% poly(methylmethacrylate)(PMMA). In consequence, the mobility of the O3-based devices was further enhanced to 0.30 cm~2·V~(-1)·s~(-1). Three acceptor-donor-acceptor (ADA) conjugated oligomers, ie, O1, O2 and O3, have been synthesized using diketopyrrolopyrrole (DPP) as an electron-acceptor unit, and naphtho [1,2-b: 5,6-b ’ ] dithiophene (NDT), anthra [1,2-b: 5,6-b ’] dithiophene (ADT) or dithieno [3,2- b: 3’, 2’-b ’] naphtho [1,2-b These oligomers exhibit identical highest attributable molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels, which were ca.-5.1 and-3.3 eV (DTNDT) as electron-donor unit. , respectively. Upon thermal annealing, all three oligomers formed thin films with ordered microstructures, and their organic thin film transistors (OTFTs) exhibited p-type transport behavior. the best OTFT performance with the mobility of up to 0.20 cm ~ 2 · V -1 · s -1. The film quality of O 3 was improved by adding 1 wt% of poly (methylmethacrylate) (PMMA). In consequence, the mobility of the O3-based devices was further enhanced to 0.30 cm ~ 2 · V -1 · s ~ (-1).