Interactive parallelizing system can provide user-friendly interactive functions and introduce user s knowledge to assist in parallelizing. It is a promising way to solve the problem of limited capability of automatic parallelizing. In this paper, an interactive environment of parallelizing compiler TIPSIE (interactive environment of Tsinghua interactive parallelizing system) is provided. Several critical techniques in constructing TIPSIE are also discussed, such as performance prediction, incremental compilation and data dependence query. The experimental results show that these techniques can get good result in improving the capability and efficiency of parallelizing compiler.