Abstract: A biological signal detection method includes obtaining a bioelectric signal and recording the signal strengths of a plurality of points in the bioelectric signal as a sequence S1=(Xn)n?N ; converting the sequence S1 into a sequence S 2 = ( Y 1 , Y 2 , Y 3 , … ? , Y j ) , ? { Y j = a , X i + 1 > X i Y j = b , X i + 1 < X i , 1 ? i ? n , 1 ? j ? ( n - 1 ) ; obtaining a group of sub-sequence Dk=(Yk)j?k?j+m from the sequence S2 with at least one arranging length (m+1), wherein 1?k?(n?1?m); counting the number of occurrences of every arrangement in the group of sub-sequence Dk and deciding a characteristic arrangement in the arrangements of the group of sub-sequence Dk; and comparing the sum of the numbers of occurrences of the characteristic arrangements in the group of sub-sequence Dk with a standard threshold, so as to identify a physiological information behind the bioelectric signal.