The time-frequency analysis can transform the time domain signal into time-frequency domain

and reveal the law of frequency varying with time.In the time-frequency representation

there are many curves

Present methods can only detect line and only be applied on Wigner time-frequency distribution.In this paper we extend in two directions:firstly we extend to apply on arbitrary time-frequency distribution

secondly we extend to detect any kind of curves in time-frequency distribution.Numeric experimentation show that this method can detect curves more robustly for low SNR signals especially applied on adaptive time-frequency distribution.