a valuable document identification method and system are provided . the method comprises , detecting features in different space ranges of a valuable document , and obtaining multi - source information ω =, wherein x i ∩ x j ≠ φ , or x i ∩ x j ≠ φ and x i & lt ;=& gt ; x j ; labeling the space position of x j with x i according to semantic constraints of x i and x j , and obtaining position constraints ψ ij ; extracting a characteristic value f i from x i , and extracting a characteristic value f j from x j according to the position constrains ψ ij ; determining whether f i , f j meet the characteristic criteria of the valuable document , if yes , then receiving the valuable document , or else , rejecting the valuable document . the method enables improved reliability and robustness of the valuable document identification system .