Effective flash flood warning and forecasting are quite important for disasters control and reduction. Recently, most studies on flash flood forecasting and warning technology focus on flash flood warning index, forecasting models, and risk assessment. This paper presented the progress and issues in flash flood forecasting and warning technology, and pointed that the suggests potentials in future studies will focus on flash flood monitoring, flash flood warning and forecasting models, multi-source information assimilation, and using different methods based on flash flood characteristics.