In view of the civil engineering special course's characteristic,the computer assisted instruction (CAI) system’s application in civil engineering is studied.Using Visual Basic program,the frame of Civil Engineering Computer Aided Instruction (CECAI) system was built,and the technology and way of every part have been researched mainly.Thereinto,how to realize the calculating questions training was the CECAI system’s difficulty and key,and it was realized through the electronic paper.The help system has realized the system’s on-line assistance function,provided the condition for this system's use and promotion.