Abstract: At present, technical process taken in as-built large-scale oil tankfarms is mainly single-pipe series process, single-pipe parallel process, double-pipe process and independent-pipe process. Advantages and disadvantages of these processes are analyzed, and principle for selecting technical process of large-scale oil fankfarms is presented. Aiming at function definition of a oil tankarm, technical economic evaluation is carried out based on types, property, quantity, turnover frequency and contamination requirements of marketed oil in order to determine technical process scientifically and rationally, avoid seeking such technical process as incredibly complicated functions, to realize the goal of low investment, flexible schedtling and lower runing costs.