Top-contact organic thin-film transistors array was prepared by slectively dewetting of 6,13-Bis(triisopropylsilylethynyl) pentacene(TIPS-Pentacene) solution.The optical microscope images showed that the morphology of TIPS-pentacene crystal was influenced by the rotation speed.The TIPS-pentacene thin-films prepared at 1 000~2 000 r/min had good connectivity and large crystal domains.As the rotation speed increased to 3 000 r/min,the patterned film became incomplete and the crystal domain size reduced.The output and transfer curve,on/off current ratio,threshold voltage and field-effect mobility of the device were obtained by electric measurements.The TIPS-pentacene OTFTs prepared at 1 000 r/min had a maximum field-effect mobility of up to 5.16×10-2 cm·V-1·s-1 and an on/off current ratio of 8×103.